Malicious PDF — malware analysis report

Static analysis result for SHA-256 1344dc6f30c009b1…

MALICIOUS

PDF

86.8 KB Created: 2021-04-02 05:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cae176e8f9826104aab12ecf8e858399 SHA-1: 9b5299f46796403a8f911485bfc7571219ce9b85 SHA-256: 1344dc6f30c009b1bbc544a999d6c496af1c822fd15ee39f2fbd9afee11ab3c3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/award?keyword=black+s+law+dictionary+10th+edition+free+pdf+download PDF link annotation
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/63f09.pdfIn PDF document text
    • http://gisowutuxa.22web.org/download_annotator_for_android.pdfIn PDF document text
    • https://tumalurezap.weebly.com/uploads/1/3/2/6/132696080/9d99b3.pdfIn PDF document text
    • http://ninozefumuwu.iblogger.org/danganronpa_1_trophy_guide.pdfIn PDF document text
    • https://gojupisot.weebly.com/uploads/1/3/4/0/134016698/7742128.pdfIn PDF document text
    • http://sidazolomaw.22web.org/24295580871.pdfIn PDF document text
    • https://kuxifegofemiza.weebly.com/uploads/1/3/4/8/134865321/navapokafu_kilewiburutabob_tipepanagep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab91ba75-eab0-4f13-844a-2f0d7cca7098/axolotl_pet_store.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96cb6775-fa3e-485f-831e-aa532dd08201/how_to_see_old_google_maps_satellite_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98345761-ff4d-40a6-875b-84ee5273865a/who_moved_my_cheese_bangla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de82e1aa-1912-4768-8b2e-d594e8612655/8975135048.pdfIn PDF document text
    • http://rupadulogoliwid.epizy.com/past_continuous_interrupted_ppp_lesson_plan_pre_intermediate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f2c405c-16ca-4317-9423-90f5f84c285f/vadum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5d142f-b5dd-4b9a-81b7-f0e830f8e258/walter_riso_wikipedia_libros_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/374ad2c4-13a8-4edb-a932-ce53d5e29754/21981073155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5823fa6d-0f00-4bb2-8e0d-a27dafbed6e5/dell_790_network_driver_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/075949e5-52ac-461e-8038-2a29b27b48a2/84938311532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd478ab4-7bd5-4c56-87d9-f7c2590243d9/59465804769.pdfIn PDF document text
    • http://bunetexugefu.rf.gd/jio_phone_audio_song_video.pdfIn PDF document text
    • http://xajejosiwoja.epizy.com/abdominal_breathing_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fda88c8-3c46-43ad-a212-3652cab6cdfc/bible_study_on_philippians_4_13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e095a8ac-bfeb-4d18-8012-77982182c3a8/accu_chek_aviva_lancet_drum.pdfIn PDF document text
    • http://buguwotibiven.rf.gd/46274064779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89b063e-b4a2-4bd4-82f9-630c5ade6c3a/37633003777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4235239c-06a1-4b11-8d74-563d401d4841/convertir_gramos_litro_a_miligramos_decilitro.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_off0001148b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 5744 bytes
SHA-256: eb2347563ad6bd3ed1f5b8943d598c9f7a739fb6dc8f33f65dc0a8369a60457d
font_01_sfnt_off00012838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12838 11148 bytes
SHA-256: d35dd8c54afcc216ad9c9990c9819ebf393d5068b5bdafdda71a7c74da75d1a6

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