Malicious PDF — malware analysis report

Static analysis result for SHA-256 433b5fe4387cc4ed…

MALICIOUS

PDF

85.6 KB Created: 2021-06-02 17:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 17e8acba02ff82acc7ae39457f908f82 SHA-1: d5109e1b07a3a52313aa12cb38cc3decaab1f666 SHA-256: 433b5fe4387cc4ed870e3c2c72867fa7a3d68b36c5fbb9e17f531ab01429055e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the linked URLs. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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
  • 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://garglob.ru/pbw?utm_term=god+a+human+history+of+religion+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446651/normal_60192be6578d2.pdfIn PDF document text
    • https://jodawozuwiki.weebly.com/uploads/1/3/1/4/131437728/6570203.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377100/normal_5fffe83d07be2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426423/normal_5ffb89d383e12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445326/normal_60248617915f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482207/normal_6017420f587b9.pdfIn PDF document text
    • https://kujepilam.weebly.com/uploads/1/3/5/3/135343620/17b89d968c.pdfIn PDF document text
    • https://gexuxufe.weebly.com/uploads/1/3/1/4/131406387/sanorisit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391893/normal_602144f8cfe7d.pdfIn PDF document text
    • https://ranefegol.weebly.com/uploads/1/3/4/4/134498511/8994e766bbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424996/normal_5fe8fd3d92716.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382621/normal_6008f509e6d31.pdfIn PDF document text
    • https://bezujopejot.weebly.com/uploads/1/3/1/6/131606295/sokopaxofad.pdfIn PDF document text
    • https://wevapagavum.weebly.com/uploads/1/3/4/3/134306171/ruwifudaden.pdfIn PDF document text
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/vusane.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
    • http://nagomax.pbworks.com/w/file/fetch/144412686/fipexinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/296ca2b9-1890-4693-aefe-7a9526fff9e4/zakejofokid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62422bba-9be3-44cb-8138-7ede5b59d45c/how_to_become_a_journeyman_electrician_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7349279-7e99-45de-b558-257a648f7445/lg_wm3997hwa_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0090e8b5-762b-4c8b-9e8d-e821d0163129/41354829292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73677326-6160-4582-a52c-fcc7727772fb/74974319405.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144413187/80448249754.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 5472 bytes
SHA-256: 8b110cea6aa124dcd461c8b52b9fb2c988adfc590520883b81769c5a6d2bb43f
font_01_sfnt_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 10916 bytes
SHA-256: 2f82b4c4d33dff69ed8e26473f9facc05abd9f7af04b448f42a56db59b7cc359
font_02_sfnt_off00013927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13927 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176