Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9788a2f6bc7461…

MALICIOUS

PDF

88.9 KB Created: 2021-05-27 05:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: c8f9c4163d5e277e320fb9369cc5f6a2 SHA-1: 328e343a0b8debf784475551b4350c0bbf901c98 SHA-256: 0b9788a2f6bc7461de75f07950f94725c48fce20163bb301e213a00123feb53a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary URL, 'https://seumenha.ru/wb?keyword=finding%20domain%20and%20range%20of%20piecewise%20functions%20worksheet%20with%20answers', is likely part of a lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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/wb?keyword=finding%20domain%20and%20range%20of%20piecewise%20functions%20worksheet%20with%20answers PDF link annotation
    • https://dovowufola.weebly.com/uploads/1/3/4/4/134438787/7423902.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448718/normal_60084af1a5d89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407989/normal_5ff50a0ca947f.pdfIn PDF document text
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/6034169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_604177c7a3863.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459477/normal_5fcea250af24e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_60171d94ea046.pdfIn PDF document text
    • https://donokodupotev.weebly.com/uploads/1/3/4/3/134317189/luzezos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_603a6ecda8707.pdfIn PDF document text
    • https://xajekegok.weebly.com/uploads/1/3/3/9/133997321/gadimulubikowaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_6039b55de396f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374835/normal_5feffb5e391a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_5fe9f6c1407a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_606544833e1bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_60368a3862a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_6049a1e2074cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_6052a44e46690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421462/normal_5ff20faa81d96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5fcdd12f4a277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443617/normal_6029eded3d3f1.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/219e88f7-ecf5-4166-ba54-9cdbf96e8032/how_to_fix_asus_battery_not_charging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ebfc66-18ff-43ac-83d7-8ad641b95a13/art_history_masters_programs_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad3b6a46-bef2-444d-b16a-2e5ce7a30220/field_visit_report_sample_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa167b26-0291-4eb0-ac65-38dfc5d8b592/are_beats_solo_3_wireless_worth_it.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_off00011bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 5648 bytes
SHA-256: 55ff9d78c9763556081edbe677c54d7611d4501ff27db4ac3cf257799b711706
font_01_sfnt_off00012f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F16 11176 bytes
SHA-256: e297b08a641264c5ada72851a241351a9ce684c17eb1cb562a2242048c7f04f0

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