Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc853e1f484ae6b8…

MALICIOUS

PDF

73.4 KB Created: 2020-11-29 13:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ff3f78d0917f2a151d8a8041fb251f91 SHA-1: 1d98c97f990532e26d617b4485f79f729ecfcdc5 SHA-256: bc853e1f484ae6b8ee9ebcc6501e783dc7ca304bd16bc1cfff5d4c22994bd7d0
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm and a ML classifier flagging it as malicious. The presence of external URIs and a high number of linked PDFs suggests an attempt to direct the user to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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.
  • 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://trafficel.ru/strik?utm_term=nikon+buckmasters+ii+3-9x40mm+bdc+reticle PDF link annotation
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/sesakaf.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/9315313.pdfIn PDF document text
    • https://xakexoxos.weebly.com/uploads/1/3/4/3/134307698/6529969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_5fb915e52cf47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5f91615b302ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_5f9377c5b671f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/guvovigo/scrap_metal_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/ishares_core_composite_bond_etf_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/kowalusoxigixavixu.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/15115113225.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_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 5908 bytes
SHA-256: 64de3d1147931271eac1db1f7d64eba4578903751277057cbf2b48d5a6b2734d
font_01_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 11552 bytes
SHA-256: 6fcbd13ecfe95377974d2141d2cec2e5831eac25bf2c8b5a28a4282e98cde155

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