Malicious PDF — malware analysis report

Static analysis result for SHA-256 0876a5cf7f269ce8…

MALICIOUS

PDF

103.3 KB Created: 2021-03-29 22:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fcdf2d1d617a6d3adb74e341a65a90c3 SHA-1: cab174966182a8d120be2db05bf8d32ef4677386 SHA-256: 0876a5cf7f269ce879d3cbfb53f9fa86d23ac231d90554ef7f3c51a3e75e14c6
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 pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/123?utm_term=html5+responsive+multi+page+template+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408997/normal_6045fd3d1f3ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_602c5ad33ffa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486344/normal_605388509a1df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409798/normal_5fc714f7076b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_60237e6b3ba6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_795edf50475648569fdcc0e9ff3062cf.pdf?index=trueIn PDF document text
    • https://a513df27-8ea1-49e5-9b48-af726a3c99b5.filesusr.com/ugd/c567c1_1a0c7a6225fd4f90b1a6f3a217ebe7f9.pdf?index=trueIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_db165b83ef3647649f122fc1eda9f2cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c5ad5c-729c-43c7-befb-ab884aea9283/lyle_mcdonald_generic_bulking_routine_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b7c575-7f00-49a2-8aca-eaffea5e7813/que_es_un_ensayo_taller_de_lectura_y_redaccion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ad69eb-a890-4807-ad0d-da542aeba5d1/how_much_is_yamaha_r6.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_bb36f43d1cfc4eaf90d4cc4f3af8bf19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d97dd46a-00a8-457c-8b3c-913c6975f695/tenebixapab.pdfIn PDF document text
    • http://mawanujabizeba.rf.gd/miller_bobcat_225_metal_cover.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_dafec44783cb495f95d54d4f91a1e5af.pdf?index=trueIn PDF document text
    • http://vujipopeb.rf.gd/will_bluetooth_keyboard_work_with_ipad_pro.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_4364d194f2894e11b6f208a6602d9f4a.pdf?index=trueIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_12b109e3b4014f2a98474d3ea3464c85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba12593d-871a-4747-9183-7321963b1d6c/digen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d46130-5946-4eaf-9e3b-f39aa87752b4/ralph_waldo_emerson_nature_beauty_analysis.pdfIn PDF document text
    • http://pejonoma.epizy.com/infinix_note_6_pro_price_in_nigeria_slot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e4cde2a-9dcd-4f89-9cd1-4810cd5c95ba/tree_of_life_movie_ending.pdfIn PDF document text
    • http://jovavajes.epizy.com/poredupinemelulijafifigiv.pdfIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_d30415c00de74bbda298c3a8c3b52c8b.pdf?index=trueIn 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_off000156fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FD 5368 bytes
SHA-256: 5bc79c8d560255e4b957b710a92f374b1b2648f73dfa6effbc740fbf18d6f602
font_01_sfnt_off00016930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16930 11280 bytes
SHA-256: b7c9578941753c0edc67f8a6395886dded7ef3a5fbee6054f752f031336688e8