Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a81ed0af089f26…

MALICIOUS

PDF

76.9 KB Created: 2021-03-16 04:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e84013da566e06c6e9abcdc666116bca SHA-1: 4c871ed618f18b7b2f833d6e752932a0608507ba SHA-256: 63a81ed0af089f2656cdbe3d6530448e9aedd1fb3a4109586da3a148b229230f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'vilenefex.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The document body, though heavily obfuscated, contains metadata related to mammogram guidelines and the wkhtmltopdf application, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://vilenefex.ru/123?utm_term=mammogram+guidelines+ontario PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482424/normal_604050a4ad9be.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/dEhgihK/43647111192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465400/normal_5fe902c96bf5f.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/gggi2ic/download_game_portable_soccer_dx.pdfIn PDF document text
    • https://cdn.sqhk.co/zomulusiku/hj4mDnk/kedon.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/ifDieiy/xavuzujobu.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/chjXpR4/is_walk_with_map_my_walk_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/biaiigh/modowozolunubu.pdfIn PDF document text
    • https://cdn.sqhk.co/dopiporajen/rjdagfA/machinarium_free_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zolokike/V6dYMno/vibefat.pdfIn PDF document text
    • https://komomagifagele.weebly.com/uploads/1/3/4/7/134705279/fokawikaxerutowe.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/KieuifL/6036490039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393762/normal_602e7b6cf0a7d.pdfIn PDF document text
    • https://vegupixusenez.weebly.com/uploads/1/3/4/3/134318628/vonafowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470703/normal_6047dc2eb14aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490736/normal_5fd137aa4402c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_ab59450e773e4006a8e271cc6b11a092.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/6542275258.pdfIn PDF document text
    • https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_1a14f83537ef4306ac877b53a7a25b9d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropuba/pivot_animator_4._1._10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/hallucinations_oliver_sacks_audiobook.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_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 5148 bytes
SHA-256: 5a832b4a3d0f9d25f61378fb81c85c762f01e6f2c6d20ccbe55acbd7147a3d07
font_01_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 10584 bytes
SHA-256: db68ffdb8ff7803754dd409f7f94fb38f1729b150b633ddef80df297ec852746

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