Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfaff5ea718f309…

MALICIOUS

PDF

69.9 KB Created: 2021-05-01 21:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3296c1b592c6c9d9e1373c0ed9d0cac9 SHA-1: 250754ce6e412b743c4880629db9f59aa1b323f5 SHA-256: 9dfaff5ea718f30936d66c9612d592892b6ee768a67486f6d9e0678fddeb789b
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URIs pointing to disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of embedded URLs and the overall structure strongly indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/strik?utm_term=problemas+resueltos+porcentajes+1+eso+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390680/normal_6033a23560f7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485163/normal_602b24d9e2d8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_602f014a76a23.pdfIn PDF document text
    • https://sanositew.weebly.com/uploads/1/3/1/8/131872303/jemoxuga-zikez-jobokawefupus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372383/normal_5fdf90e25bbef.pdfIn PDF document text
    • https://falijufik.weebly.com/uploads/1/3/5/3/135349852/kesefizexibus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5fd670d4ba7d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_6029a1561f9a1.pdfIn PDF document text
    • https://gareketekefebon.weebly.com/uploads/1/3/4/6/134695024/sotigorejeji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499002/normal_5ffa53e20082d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483856/normal_5fc9b545b1d38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_604774ee535e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fanuzisi.epizy.com/genewadufowirivabel.pdfIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_c482b6d4abb54b758054a8ad8001df43.pdf?index=trueIn PDF document text
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_bb4ccdc475484f7b965ddf97355157dd.pdf?index=trueIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_a816f56f1d254bb0b63bd3aaa4a1292f.pdf?index=trueIn PDF document text
    • http://xotujulenibol.epizy.com/novodiwovavowevu.pdfIn PDF document text
    • http://kosatalek.rf.gd/guided_reading_level_g_chapter_books.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_off0000d20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20D 5572 bytes
SHA-256: 41d59907d5ba38260899ad5d6174e5bcc24ee0356f50c8ff93b4099ba29c058f
font_01_sfnt_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 11532 bytes
SHA-256: 2f23e256a8f22fa06011b3904e6b4504a1c95c1b2bba72a94d348a9d941e993d

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