Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a38ce3812e66840…

MALICIOUS

PDF

79.8 KB Created: 2021-04-14 04:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4e343d54f0afab3dbb3a93e690d09866 SHA-1: d0ef1639c60fa193c4763ae631aa03ce65eaaf23 SHA-256: 3a38ce3812e668405fc926949a4ccdfc072fb3ecdf93b3b32c73b4bb76e5ad5e
186 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, with one heuristic specifically identifying it as a PDF link farm on disposable hosting. The primary malicious URL identified is https://baarspo.ru/strik?utm_term=osho+book+of+secrets, which is likely used to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=osho+book+of+secrets PDF link annotation
    • http://oneplusonemain.xyz/fifty_shades_darker_movie_cast_mrs_robinsonla8wl.pdfIn PDF document text
    • https://pabifiliponisod.weebly.com/uploads/1/3/4/3/134367040/a7423561476aea.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/the_watsons_go_to_birmingham_chapter_12_quizo68tj.pdfIn PDF document text
    • https://xaweworamek.weebly.com/uploads/1/3/4/6/134610398/0804b5e76a3.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://galoomer.online/bushnell_telescope_model_78-9512_partsku9bu.pdfIn PDF document text
    • https://wemezixogasowed.weebly.com/uploads/1/3/1/6/131637562/xanijufik_zuripijunarogo.pdfIn PDF document text
    • http://gladkoe-telo.xyz/michael_jordan_the_life80low.pdfIn PDF document text
    • http://re-prime.ru/zobebivudowowumopojesfvj49.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/5bd9b17a-e548-4664-8eba-690297497987/google_chrome_android_custom_search_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4755fd56-d9d1-4eef-a5fa-e740c9872bcc/37810849264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d73e72f0-79a1-48d8-9265-aee0019bff68/81805825093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f32dcb-5f33-40af-b2de-faaa87d389d1/why_is_my_fios_router_blinking_red.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee09be0f-f8ae-4b60-beeb-edce4eef8738/how_to_replace_motor_on_kenmore_90_series_dryer.pdfIn PDF document text
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_c5f6f42e757543b19891b7705561cb57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/452a93fd-9035-45a6-849b-ec0180fb7727/zeruwaleb.pdfIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_21af4a6352d04b34acd4028dd076d597.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39397f1-ed69-42cd-b9b8-a67fa821c148/corporations_have_a_role_in_establishing_their_communities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b9451b-e935-4acd-8c2c-ff30fa24f0c0/mewutukiwovoropegunu.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_50ffff71848b4a43972038f1b119c6d1.pdf?index=trueIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_c3053115fe2441fea37b3f35d850dd3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b4b3963-5fe3-4e39-8460-2a716eb6c852/resumen_espaa_en_el_siglo_xix_6o_primaria.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_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 4956 bytes
SHA-256: 416967eb4948b975d74ea4049cc1086b385e0fd6134fc37d7df113674c5939fd
font_01_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 10692 bytes
SHA-256: e450ed1c41161f3cd669b5b3037878725e7cbb228a8fde6b7e3a4955a17a5612

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