Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8c0507080c8d1a…

MALICIOUS

PDF

76.8 KB Created: 2021-04-27 19:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: edfd684526516899bbcf769206b0616e SHA-1: 2d9e80216acc6401ba4225a25a8d2eeac65aa814 SHA-256: cd8c0507080c8d1a99dd4f1c8d3572af18ebc6e30cd687b92e15339c056e3d3e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is part of a link farm designed to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=how+do+you+prove+aas+congruence+rule PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389816/normal_5fe0cc569eb6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_60454c093d55a.pdfIn PDF document text
    • https://cdn.sqhk.co/fixefalid/ggf3TUL/broken_bones_kaleo_guitar_chords.pdfIn PDF document text
    • http://wasegulom.mygamesonline.org/67839524118.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/igijc2t/48013305184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475565/normal_5fe7fa2684798.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426072/normal_5fe0575b236a8.pdfIn PDF document text
    • http://moxupasasitote.mywebcommunity.org/jadotigapulesaroneraraze.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/ebMYM3G/short_stories_in_english_for_beginners_teach_yourself.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/8gEnAws/mifobawowiwakifadotuwuli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_3f2e03393c3a4c398f737de613f7442d.pdf?index=trueIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_5210b539d0a14170a1c282507b2fa31b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8c9f6d-7c8f-4458-bf79-f0881cb37a71/72377643449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc2cfb40-5164-4107-aa6c-3e286b2f5fa2/road_signs_and_their_meanings_in_uganda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cbdd338-1a98-4b31-add6-931500166b75/finerediju.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_e043118f3bfe498a8add22e7a7d26d2f.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_68694dfa2a864509af3790da0a83ea9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/714d18d4-9677-447f-bff6-b46400943cda/are_penny_stocks_on_nasdaq.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_009fbce2753f4962bb5d6f094d02ac8b.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_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 5456 bytes
SHA-256: 945ba36fea24deb865aa35a328ef56e25f17db3de77ba1bf2a30146e8107f5b4
font_01_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 10080 bytes
SHA-256: ed1bdca5ae2cdc2670c8f207e76659ccdc804b0872daca53340382ef2a7d096a

Open this report in the interactive analyzer, or submit your own file for analysis.