Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae48941f9ca8d5a1…

MALICIOUS

PDF

83.3 KB Created: 2021-02-15 17:51:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3a4ea940ecc6501835ce4d35de2fa79d SHA-1: f9a6d51113e96a6da902fc8a80c64594ba7144d9 SHA-256: ae48941f9ca8d5a1c0cd8fe2da3e27911e1a53d8a01d7386676661b9392e0540
206 Risk Score

Malware Insights

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

The PDF 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. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=ruger+mini+14+vs+ar+15+accuracy PDF link annotation
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/3287443.pdfIn PDF document text
    • http://pimebujeben.66ghz.com/29759663763.pdfIn PDF document text
    • https://futiwoku.weebly.com/uploads/1/3/5/9/135957929/1e6215df3f9737.pdfIn PDF document text
    • http://fevozogu.iblogger.org/xapenatofunimetafeku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487005/normal_5ff52a5143f68.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/3251386.pdfIn PDF document text
    • https://zororoxuz.weebly.com/uploads/1/3/4/3/134309160/giviju.pdfIn PDF document text
    • https://nakuzimatixibo.weebly.com/uploads/1/3/5/3/135388853/3596595.pdfIn PDF document text
    • http://vivoxasoro.22web.org/72061816269.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wajiletum.epizy.com/nudamedarasosadupo.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/coderush_custom_templates.pdfIn PDF document text
    • http://woxedizoxe.rf.gd/80587616000.pdfIn PDF document text
    • http://tofarogupa.rf.gd/43917573941.pdfIn PDF document text
    • http://xamorapex.epizy.com/xugufoxinaxol.pdfIn PDF document text
    • http://baromar.epizy.com/begivis.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_off00010872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 5520 bytes
SHA-256: bbfc848c8e0a161fde3865c2e4a06bc1850d2d5db7a817766e6dafcd48c76f21
font_01_sfnt_off00011b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B48 10832 bytes
SHA-256: f0b576864d9068b598a1127354b381364baa7825ebe7e692c3d7a38206f12cb0

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