Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a96f0132859e78…

MALICIOUS

PDF

66.2 KB Created: 2020-12-13 15:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 554cb77a5310b870259c9cb37cfc4007 SHA-1: 7615dd38f798309a389197ae8e01a0c10c5ee121 SHA-256: 78a96f0132859e788b99ec7c5070a31539318dc74f4b708455f8142b1a00be99
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. One prominent URL, 'https://traffset.ru/strik?utm_term=riddex+sonic+plus+pest+repellers', is directly linked to a heuristic firing indicating a potential phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content, likely for initial access 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://traffset.ru/strik?utm_term=riddex+sonic+plus+pest+repellers
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/diroxarij-tuzeli-vamabo.pdf
    • https://cdn-cms.f-static.net/uploads/4417128/normal_5fbe859ce247e.pdf
    • https://musonilemif.weebly.com/uploads/1/3/4/7/134752032/1723301.pdf
    • https://baduzizexajozej.weebly.com/uploads/1/3/4/6/134653824/96fc0be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zamuriza/7068553441.pdf
    • https://s3.amazonaws.com/kelukakeb/36265945462.pdf
    • https://s3.amazonaws.com/gavexilatuvitaz/coordinate_covalent_bonds.pdf
    • https://s3.amazonaws.com/nawosineromigi/84106770700.pdf
    • https://s3.amazonaws.com/gozilum/spark_iv_windows_10.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4af0cb3e0f577145b0ab/1606372083289/rufujerobuwov.pdf
    • https://static1.squarespace.com/static/5fc16c877848ba205d1c3861/t/5fc294a39ee0f32b87a712fb/1606587559045/jaserekanatudixomapigo.pdf
    • https://static1.squarespace.com/static/5fc2cae0c30a162e0c5ec24a/t/5fcf1c9064290b1c3dd06740/1607408794132/kanto_pokemon_in_sword.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_off0000c776.bin
6ef35f6a0e4ebf8c19bdb6036a8533b38db95b7610ef25141be620afd2781241
pdf-font-stream PDF embedded font (sfnt) at offset 0xC776 4932 bytes
font_01_sfnt_off0000d857.bin
b67bd295fcb5e4509368cf077c17cf4123817cfe56559c37e2e915cdc5e7d43a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 10548 bytes