Malicious PDF — malware analysis report

Static analysis result for SHA-256 87364659abc7082d…

MALICIOUS

PDF

70.8 KB Created: 2021-02-17 06:59:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 175880f99d30585c6339dd830683a1cd SHA-1: f78fc537874e4e7aad5c4fec3cfe6c5841d95011 SHA-256: 87364659abc7082d38a192f672b782451a0871e3994c394de514c0899a7eb350
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://jottigo.ru/123?utm_term=statistics+and+probability+grade+11+pdf+learners+module', are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jottigo.ru/123?utm_term=statistics+and+probability+grade+11+pdf+learners+module PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496148/normal_5fe628f19983a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_602a59ce6616d.pdfIn PDF document text
    • https://penogefuf.weebly.com/uploads/1/3/2/7/132740618/wukowuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476767/normal_602b7c296b9e2.pdfIn PDF document text
    • http://wutomomar.22web.org/worlds_hardest_math_problems_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481285/normal_5ff3eb53eae34.pdfIn PDF document text
    • http://mosaniz.22web.org/zelis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406229/normal_5fc5ea6617499.pdfIn PDF document text
    • https://moxigowa.weebly.com/uploads/1/3/0/8/130814106/kamerod_fotekaloz_kejumixazusime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_602570f5e93ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425723/normal_601577662ca61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499984/normal_5fffa9190d2ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485807/normal_5fdc4ef72b770.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443325/normal_5ff529de31f9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_602380d9ce688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406776/normal_601c5d29be761.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xelilurezo.epizy.com/android_10_pixel_3_root.pdfIn PDF document text
    • http://gonaviniji.epizy.com/piriformis_muscle_spasm_icd_10.pdfIn PDF document text
    • http://xibiwoziveva.epizy.com/694155015.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_off0000d429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD429 5872 bytes
SHA-256: 59db954bce932d0b2e88664c556583fbc0ac1ac24cd0268e1c0d8224c4827df5
font_01_sfnt_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 10452 bytes
SHA-256: b5352aab3b226d2254e42de4ac6fc3156a9f2de5ff4dae17f2f84d18bfbbab22

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