Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a0a0baf54eb481…

MALICIOUS

PDF

78.5 KB Created: 2021-03-25 04:03:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57d9309353e2f08aad9d2ecc98bcb50a SHA-1: 27e4b7762af8fa5c549b96d617b529b2486c7b1d SHA-256: b2a0a0baf54eb48105037290d05a9b351ed727d108c3dd330206ef3567b02cb1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains a large number of external links, forming a link farm, with the primary URL being https://seumenha.ru/strik. This suggests a phishing or SEO manipulation scheme designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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+use+a+shaker+bottle
    • http://wulutapebime.getenjoyment.net/82043212236.pdf
    • http://kesogapebenem.iblogger.org/niruf.pdf
    • http://lefibipefazefep.mypressonline.com/ant_man_comic_espaol.pdf
    • https://static.s123-cdn-static.com/uploads/4449205/normal_5ff8fdb61412f.pdf
    • https://cdn-cms.f-static.net/uploads/4466151/normal_604db157d7886.pdf
    • https://cdn-cms.f-static.net/uploads/4488581/normal_6023daaf3505a.pdf
    • https://cdn-cms.f-static.net/uploads/4424349/normal_60548b7557239.pdf
    • https://cdn-cms.f-static.net/uploads/4455396/normal_60395131cd306.pdf
    • http://bulepozobagepud.mygamesonline.org/favapemufenokalokam.pdf
    • https://static.s123-cdn-static.com/uploads/4446776/normal_5fe0ecc0d1c79.pdf
    • https://cdn-cms.f-static.net/uploads/4482869/normal_60240c5bb5260.pdf
    • http://kofodotig.sportsontheweb.net/nefekikojixu.pdf
    • https://static.s123-cdn-static.com/uploads/4449397/normal_5fe05f5059fed.pdf
    • https://cdn-cms.f-static.net/uploads/4446638/normal_5fda5e5af0f06.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_21498902f15b4e75a32cc35219628cb1.pdf?index=true
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_304042a430484ed79e7e9c4aaa0ebcd9.pdf?index=true
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_bdfd21d2b2a14e5fba0823026d466b58.pdf?index=true
    • https://77abcf6a-1f47-4233-a5f7-28832101be0a.filesusr.com/ugd/e29e5c_885fc70f080d4684903d572e327151d2.pdf?index=true
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_57899ffed0934f2cb1da3ea418d06b9c.pdf?index=true
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_afeca6b729fe4612b1bc2775df5e0a96.pdf?index=true
    • http://xuzupazona.epizy.com/36024366078.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84c.bin
95cca750607a8b200354889f98fcaebb70ed3b651c929c302a782a519961b689		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE84C 5000 bytes
font_01_sfnt_off0000f973.bin
5964fe0ce4ffecd48a2f83cf6b00c97dff395972a77faf6c99dfaed16b9838ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 10380 bytes
font_02_sfnt_off00011cc7.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 4324 bytes

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