Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ed248324c81bc4…

MALICIOUS

PDF

68.9 KB Created: 2020-12-10 20:22:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 141e84295151976ff68ff72645d8118d SHA-1: 5835a45a5a4c293aa0e6bab09e118dfa06e93a83 SHA-256: e0ed248324c81bc4eb08dab51e383603026a1fd4c5603ac56ecc4a8e05fed7ec
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning attempt. The primary URL, https://trafftec.ru/strik, is likely part of a phishing or malware distribution campaign. Although no scripts were extracted, the heuristic firings and the nature of the embedded links strongly indicate malicious intent.

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://trafftec.ru/strik?utm_term=comparing+meiosis+and+mitosis+worksheet+answers
    • https://nutefowamedez.weebly.com/uploads/1/3/4/3/134330341/6224260.pdf
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/taxak-libeluwat-nofaxadajobarop.pdf
    • https://static.s123-cdn-static.com/uploads/4387226/normal_5fc8f0795659b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jazuravazaguz/2220519833.pdf
    • https://s3.amazonaws.com/jesidofefe/nutiga.pdf
    • https://static1.squarespace.com/static/5fc59d7c68612547ed7e118f/t/5fce68529aa2de0c64c9427f/1607362643553/withings_watch_battery.pdf
    • https://static1.squarespace.com/static/5fc2aa4c27a199023ac0c258/t/5fccaba383d2ac65cc0f8342/1607248814754/88244798201.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd08c0b7ee8e70759ffab8/1606224065329/48060866636.pdf
    • https://static1.squarespace.com/static/5fc290cdf9866f3fd2dedb6b/t/5fc6bbe648d5672cfb26e7f6/1606859752288/plants_vs_zombies_free_apk_uptodown.pdf
    • https://static1.squarespace.com/static/5fc587ece2fce462bcab511b/t/5fcbf1bc260a660a6bc450c7/1607201213570/72706595274.pdf
    • https://s3.amazonaws.com/lerezazo/57571490157.pdf
    • https://s3.amazonaws.com/tesotiwapax/nuvuxafonu.pdf
    • https://s3.amazonaws.com/didowugorokirug/soliwagusozawus.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_off0000d15d.bin
94a593178a2504109a7f02708f2e93b8150f21c94e9326c35aabf53873a8fb82
pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 5400 bytes
font_01_sfnt_off0000e39b.bin
91f324ffb98ef8d85175a7f1c75dea3a5be06fd4eff1f595f4eb6826bdfd0a27
pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 10460 bytes