Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a3daca35a83e29…

MALICIOUS

PDF

74.7 KB Created: 2021-04-07 19:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3c6e2f1c6d34c206e0b595f8f1b350b5 SHA-1: 31fbd993b64102f12976bbb924d7f835a1bc5e7f SHA-256: 72a3daca35a83e290dd57aa81f83ec49b23f1e92d4c5466e0a0575ec199e3157
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the link farm suggest a phishing or malicious redirection attempt, potentially using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/123?utm_term=cnp+assurances+annual+report+2018 PDF link annotation
    • https://felomavemupej.weebly.com/uploads/1/3/4/5/134583365/6438707.pdfIn PDF document text
    • https://mixizuvas.weebly.com/uploads/1/3/5/3/135383824/gigosed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413475/normal_60543c216f954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450156/normal_5fdad70aad89d.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/PigiiSx/kifugosumo.pdfIn PDF document text
    • https://cdn.sqhk.co/pedagukar/pwIijjc/warhammer_adventures_attack_of_the_necron_review.pdfIn PDF document text
    • https://gilawidukawopux.weebly.com/uploads/1/3/2/7/132741225/4741556.pdfIn PDF document text
    • https://cdn.sqhk.co/xifusajexom/BPhbLsM/syncios_audio_recorder_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485149/normal_5ff1465d90781.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/dnrgj62/pc_creator_pc_building_simulator_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385422/normal_5fc6f3b368fb3.pdfIn PDF document text
    • https://wokesije.weebly.com/uploads/1/3/4/5/134597961/gipopumiwilalenonu.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/eijOBiu/zapezizojixewedevibolo.pdfIn PDF document text
    • https://pelunukemuf.weebly.com/uploads/1/3/0/7/130776607/c93a1d1304a360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_603ebbfcbe8df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_c2c5c4cf42c84afbac9009aa77ae272d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02fc6b9b-479f-4e79-873e-d05c59f68d11/who_invented_telescope_in_1608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c000d519-4c21-4ff7-ac95-adbbf01a886f/apc_back-ups_es_350_flashing_green_light.pdfIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_f812255dfe524dca8564b8eeaf08fe3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a96076-cb4d-4645-8837-16a33ee1859c/student_record_management_system_project_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749818f0-455e-41fa-8693-7b823f09b70a/pomexujuxiluxibizutodu.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_6f752eab9239496f9ea39921a976516f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26588eb-2521-45c1-a61e-8a1adbfc5f53/wekoxuwogisud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c13501-d3ea-4488-bc64-ab81e8f66353/62214976542.pdfIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_f9288f0f2a9c42dc85ca4160e794a694.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b3e8ec-60dd-498f-817a-9703836e3ea5/how_to_restore_ipod_nano_1st_generation.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_cfa32eb9bb6348688f39db140252b25b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da4480e-216a-4d6d-abe2-ed9d5d6c9b92/a_que_edad_del_caballo_se_puede_montar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/730a1da7-21a5-402e-a6ac-0b57165d8ee5/who_owns_wgn_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/451592b6-d559-4aed-af61-ec218096e6d0/alphatrak_2_test_strips_and_lancets.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 5352 bytes
SHA-256: 499c96b22b37af6b4f3f5c9320caeef67c24f59e92b338eca71c16fd708e7b3a
font_01_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 11332 bytes
SHA-256: 0d72e1c2d6bbdabf60c64749dd0d8a355bf0a69e39d44e81146540762523f102