Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0a337f42e55ad7…

MALICIOUS

PDF

100.5 KB Created: 2021-03-21 21:57:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c5408d805308c9d3be90fdb15dddf5e1 SHA-1: 6a4a1cdaa0fa9296ad6183c3083f38070f1835ca SHA-256: af0a337f42e55ad7f68887f9d660fdc6434b54abcdc858e3a6046407a0550741
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `https://dafemum.ru/award?keyword=functional+python+programming+lott+pdf`. The document also features a large number of external PDF links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were extracted, the presence of malicious links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=functional+python+programming+lott+pdf In PDF document text
    • https://vatifogogunubit.weebly.com/uploads/1/3/4/7/134725392/butijavozizozi-kitesokof-kelamovema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5fdc4cafc88f2.pdfIn PDF document text
    • https://nazewaraja.weebly.com/uploads/1/3/5/9/135959380/9196235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426953/normal_6007530e24626.pdfIn PDF document text
    • http://beamorem.com/grievance_form_templatemndsf.pdfIn PDF document text
    • https://wofofubuw.weebly.com/uploads/1/3/2/7/132710679/7884313.pdfIn PDF document text
    • http://xerepanidobop.iblogger.org/pilibenatutigewirupoxim.pdfIn PDF document text
    • http://characduwe.space/36747289597fw375.pdfIn PDF document text
    • https://vakexojukesazi.weebly.com/uploads/1/3/0/9/130969985/5215065.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/16da815d-2c9a-4c85-9cbd-3e3aa5945c4a/descargar_ana_gabriel_30_grandes_exitos_mp3.pdfIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_290627fe63b4465d966024763adc0e41.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_fc5274996bf442d8a2a7a0861575c968.pdf?index=trueIn PDF document text
    • http://dowijasimenazo.epizy.com/guideline_central_cord_syndrome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d09e708c-355a-4e28-b6d0-46c25410e40d/11019922541.pdfIn PDF document text
    • http://tapejufujol.epizy.com/10859071219.pdfIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_0b48894465b74a3c892f73d94fd8c516.pdf?index=trueIn PDF document text
    • http://zakebopo.epizy.com/retaxobiwagalifizezibuveb.pdfIn PDF document text
    • http://sopazanit.rf.gd/lijinime.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 26296 bytes
SHA-256: 458a0ac91e1ac6bae14a832e2b87cbec2f46f6d75ba612a7122c0e3f8137e78c
font_01_sfnt_off00013d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5C 5212 bytes
SHA-256: 4c0ce7aa98a853e38d9ec36f1aa993df60f88b9c412add51178eb29db602cc27
font_02_sfnt_off00014ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE6 11168 bytes
SHA-256: 1a534e7492761e42486b6baa7444b55bd130583a01c18ffe2825246b9a509f34
font_03_sfnt_off0001745f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1745F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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