Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae4c0ec2a8bedc7…

MALICIOUS

PDF

70.9 KB Created: 2020-11-19 04:08:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 726259b833e09303b331f34a8970b480 SHA-1: 1aa615d4ee9c4aa8586e4781e20ec7876d7953b8 SHA-256: 4ae4c0ec2a8bedc72408f8ab0f9b4f1fdc58006e43f834652f8c09ed31cb04f9
156 Risk Score

Malware Insights

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

The PDF document contains a lure related to a 'Sharp 40 inch tv tesco' and exhibits characteristics of a link farm, with numerous external PDF links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=sharp+40+inch+tv+tesco
    • https://dozexida.weebly.com/uploads/1/3/4/5/134590021/zevizuri-butiwe-puxumanimiw-lajafidipetena.pdf
    • https://totobulamu.weebly.com/uploads/1/3/4/3/134310137/d086bd8801.pdf
    • https://xugasejesakegeg.weebly.com/uploads/1/3/4/6/134617370/9174370.pdf
    • https://zoludapi.weebly.com/uploads/1/3/4/5/134528767/7836791.pdf
    • https://vasuxuduka.weebly.com/uploads/1/3/4/3/134322555/8292888.pdf
    • https://lupuxamugegudi.weebly.com/uploads/1/3/4/6/134623484/6654219.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/pufego-ludajikef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vuterijoze/minecraft_blaze_skin.pdf
    • https://uploads.strikinglycdn.com/files/942bdaf4-9c4a-4106-98b9-9860a579ead7/19637025028.pdf
    • https://uploads.strikinglycdn.com/files/572a614b-aec6-4417-9631-99924195bf5b/nero_burning_free_download_full_version.pdf
    • https://uploads.strikinglycdn.com/files/6e15f8c1-c696-476c-b809-f6e44ab4d4bc/24738778664.pdf
    • https://uploads.strikinglycdn.com/files/7a8b8647-6794-43c3-8ff5-4ea2aaf308bb/mp3_reggaeton_nuevo_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb8e.bin
d5fbddf2f68a3323d140754c6399a94c310ea4838a14d6180c33a75d66bbe7d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 5168 bytes
font_01_sfnt_off0000dd0f.bin
aa7fb4a8abe8084c045b5d447be549626610338054269e8e85d050134ec7befc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 10520 bytes
font_02_sfnt_off000100c7.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 4324 bytes