Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb647ca6b4f94d3…

MALICIOUS

PDF

77.7 KB Created: 2021-01-15 00:22:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b05ad5363e6f2e0432cec2c621d9645 SHA-1: d8f94043c8448cd79c38091d723ddfcdd0e3fb9d SHA-256: ebb647ca6b4f94d398bcbc1676f45dff5400b755a6897b33b2410da925db4800
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=hearts+beat+loud+parents+guide
    • https://kebolegenadudus.weebly.com/uploads/1/3/1/4/131454121/sagubip-nazejepinetato-wexajuvezon-vigozo.pdf
    • https://static.s123-cdn-static.com/uploads/4477877/normal_5ff5ef81ca7a8.pdf
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/8484876.pdf
    • https://ragenakesigufu.weebly.com/uploads/1/3/2/7/132740294/5023705.pdf
    • https://cdn.sqhk.co/sigidezok/jdQibjg/extra_long_press_on_nails_coffin.pdf
    • https://texolobalow.weebly.com/uploads/1/3/4/5/134597330/jozoke.pdf
    • https://xikisujegowo.weebly.com/uploads/1/3/1/8/131856166/3787163.pdf
    • https://pazivumamitobe.weebly.com/uploads/1/3/0/7/130739218/kakexi-muxunajikutu-dasugisirafev-jenenasuguge.pdf
    • https://tifobavojosimiz.weebly.com/uploads/1/3/4/5/134505066/6301039.pdf
    • https://padilokemim.weebly.com/uploads/1/3/1/3/131381900/razezelire.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vipuxafol/auto_root_tools_3._0.pdf
    • https://s3.amazonaws.com/zarelusipofox/ziketutela.pdf
    • https://s3.amazonaws.com/telasebisu/22378108153.pdf
    • https://s3.amazonaws.com/kokesatodixon/13909273352.pdf
    • https://s3.amazonaws.com/vukusa/develop_simple_web_browser_in_android_studio.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_off0000f15b.bin
14e3c91d0c9b6ff0a6ba1194105dc05139fd41b9159a3e5a21aec2803d18ae60
pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 5228 bytes
font_01_sfnt_off00010327.bin
db80c45a3c77893b59a7444e0c4577d70cdff0a0d2a0ca73330ef2ad0d418228
pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 11432 bytes