Malicious PDF — malware analysis report

Static analysis result for SHA-256 4606cedd6ad25a94…

MALICIOUS

PDF

83.8 KB Created: 2020-12-18 20:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6647bc87b6a0ee7750458bbb0de22220 SHA-1: dd8b9f509ab670e81ab7b9a8a606d6073c747980 SHA-256: 4606cedd6ad25a948591287932af6a107c4a6aa57f8814748f473346db81965b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, one of which is associated with SEO manipulation. While no scripts were extracted, the presence of numerous external links suggests a potential for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/square?utm_term=bodoni+72+font+family+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447098/normal_5fbe0b32877e5.pdfIn PDF document text
    • https://dakovogusuzulex.weebly.com/uploads/1/3/4/5/134595229/vukumogasusesim-domin-wurinaruf.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/39185b.pdfIn PDF document text
    • https://wevokowuluza.weebly.com/uploads/1/3/4/7/134739861/vebunavutunoder-zevopiw-dekigakale.pdfIn PDF document text
    • https://nitetemefugek.weebly.com/uploads/1/3/4/7/134772401/c8ddb3094287a0.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/9280960.pdfIn PDF document text
    • https://zadumujiz.weebly.com/uploads/1/3/4/6/134626950/4619566.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc4e3c612facd59cec67b06/t/5fc6b89856cd4459b39fd26f/1606858904907/70273735963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9351b4e7-b111-4ae4-923f-a7033c200fad/63597406634.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcef8aef07fd00950dd52af/t/5fd126cac569143fbdb89746/1607542475845/nerd_vs_zombies_apk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 5236 bytes
SHA-256: 58b8a367dfbce608ce1c2911539da6bb205e69f892e90c56115224aef0725d43
font_01_sfnt_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 3656 bytes
SHA-256: afddf2cad968696d801fbd11f02dc79dc842446b2ae044856ba23c8e73c3d932
font_02_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 21596 bytes
SHA-256: d8b529e4d88dd536bb5f7d50cd332009bf28f10fa2558d412cfb4ad8be1f60a4
font_03_sfnt_off00012cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAC 16084 bytes
SHA-256: a3b8ae6cb61a975f1aaa3bdf1d75290c2750726bc6c8d8b6ec62e4e9f5cc9978

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