Malicious PDF — malware analysis report

Static analysis result for SHA-256 849152812fc863be…

MALICIOUS

PDF

65.4 KB Created: 2020-11-19 07:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7f8ded8377e0bfbf0609f787f3941ac SHA-1: 765a378c9bce470a701ca12b80e0d3fc407e76a2 SHA-256: 849152812fc863bed9318f83e81b91d97bb3b9034601c4f521319193f9ed5ef9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains heuristics indicating it is a malicious phishing document, including a link farm and a callback lure. It also presents a visual download button, suggesting a social engineering attempt to trick the user into downloading further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/123?utm_term=looking+out+looking+in+15th+pdf
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5fa29b8f3a0a3.pdf
    • https://cdn-cms.f-static.net/uploads/4412173/normal_5fa471150bcf3.pdf
    • https://rarogifiteli.weebly.com/uploads/1/3/4/5/134529860/45b85cebe8d354.pdf
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f87c2ff1cbcb.pdf
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/gupukipiv.pdf
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/dubupaxan_derekojav.pdf
    • https://cdn-cms.f-static.net/uploads/4374203/normal_5fb4d8b0b1c01.pdf
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5fb2d4255ca1f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/memul/brkert_6014.pdf
    • https://s3.amazonaws.com/fukezavazuj/36779523891.pdf
    • https://s3.amazonaws.com/gaxuremewuger/tall_side_table_ikea.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3bf.bin
954abd1ef58e215826d7eefc00abd3a558e8fa6254261e32a29521aac851cd31
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BF 5000 bytes
font_01_sfnt_off0000d4da.bin
ff6585f9cec849a00b1814302b4803ea3c429d7a27122e95f42869db5a5aa5d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 10744 bytes