Malicious PDF — malware analysis report

Static analysis result for SHA-256 382c39d57fdd5eff…

MALICIOUS

PDF

66.3 KB Created: 2020-12-28 20:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b25e79f7527b4da4722138a7fc970adb SHA-1: ba7d6d188ae8a2a18c8ff9a131da3df5fae90bc5 SHA-256: 382c39d57fdd5eff9fb6ed51ec937a6c21cba328fc4122f8b29545377e9882f6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'trafffe.ru', indicating a potential phishing or malware distribution attempt. The 'PDF_SEO_LINK_FARM' heuristic suggests a large number of outbound links, likely to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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-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://trafffe.ru/123?utm_term=earthworm+virtual+dissection+game
    • https://static.s123-cdn-static.com/uploads/4479454/normal_5fe41a74bf7ac.pdf
    • https://cdn.sqhk.co/duxajoje/eEjajfR/bizimaborixujajefexe.pdf
    • https://xogevowizixid.weebly.com/uploads/1/3/0/9/130969953/8748001.pdf
    • https://cdn.sqhk.co/reretukida/70jgPYI/51489885377.pdf
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/jafinupud.pdf
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5fafb0b8f2cca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8c414559-e264-4fd5-883a-a8d075df7048/xavonofedufupimisedi.pdf
    • https://s3.amazonaws.com/sizadagazagaj/jane_erin_carrey_american_idol.pdf
    • https://s3.amazonaws.com/pisedij/anomalias_congenitas_del_aparato_reproductor_femenino.pdf
    • https://s3.amazonaws.com/zirojopemup/85967725058.pdf
    • https://s3.amazonaws.com/bidivo/kadunesijupuwuboviv.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_off0000c5ad.bin
e7848981d4969af92d6fe56a3b8fb0bfb4a02cbfc0ad318c0c9ff1da2723f426		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AD 5460 bytes
font_01_sfnt_off0000d832.bin
f369acf580b9d6722f254bf5c8b389c51af000832ccb1ba362d8f3beb48d7084		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 10828 bytes

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