Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85cf108a1cc1921…

MALICIOUS

PDF

83.8 KB Created: 2021-03-10 03:56:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 093954f0eae92e27fc5057af7e7b981c SHA-1: 947e28110ed62da7306300ed71e4435cfdbc20ea SHA-256: a85cf108a1cc1921ebbd53964983049b024ee518cd61c27f5b215c9afce9e81b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on disposable domains. The primary purpose appears to be to drive traffic to potentially malicious or phishing sites, disguised as a user guide.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=mpasm+%2526+mplink+user%2527s+guide PDF link annotation
    • https://bapajoronugenig.weebly.com/uploads/1/3/4/2/134234589/nenunozubamudomofa.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/mgjgihj/games_like_dungeon_defenders_for_android.pdfIn PDF document text
    • http://alcexpress3.xyz/gijedumovb6221.pdfIn PDF document text
    • https://jibanexoruna.weebly.com/uploads/1/3/5/3/135338247/79c4ba2d0.pdfIn PDF document text
    • http://itfamily.info/ap_human_geography_vocab_chapter_4swmyf.pdfIn PDF document text
    • http://fabulouss.space/dofokidevibepoxubaked9v4t.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/oqFHcjj/85016304944.pdfIn PDF document text
    • https://bifekanivixu.weebly.com/uploads/1/3/1/4/131408854/8315726.pdfIn PDF document text
    • https://vatopefo.weebly.com/uploads/1/3/1/3/131398509/7017646b5ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_5483452d6f2e4859afecfa02d1f66360.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votawawo/46507790874.pdfIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_e24c6c2e9feb472d82d965db6b4d8960.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_8457bacc8e8a4a98aac13da61e633a74.pdf?index=trueIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_1a606b1787c840e880ea8daa339e3b7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizaxo/area_of_composite_rectilinear_shapes.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/calendar_template_for_powerpoint_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/41289986479.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_2833a73b999d418e94bcd9e54978fcc9.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_off00010208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 4836 bytes
SHA-256: 62f87b390a1ded54a96db892f732b2afbf09ec169cac0196251878506a4dae05
font_01_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 15468 bytes
SHA-256: 20ad41b5b11295a6de873dc519c93bb38e6f5d1f6052f5c19cdbe56c99c48ac1

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