Malicious PDF — malware analysis report

Static analysis result for SHA-256 6792481cdaccadcd…

MALICIOUS

PDF

79.9 KB Created: 2020-11-13 15:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fb48d9fc5abf9af315174e21ba274669 SHA-1: 81b4069eea781cef3d1e5f38ec413aae807e651a SHA-256: 6792481cdaccadcd87d545a5e388294add467c1bcb0453a3e055e00a4307f1d1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, with a critical heuristic detecting a large number of external links, suggesting a link farm or redirection scheme. While no scripts were extracted, the presence of numerous external URLs, including one pointing to 'trafftec.ru', indicates a potential phishing or malicious content delivery attempt. The document's metadata suggests it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which aligns with the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/aws?utm_term=the+leftovers+theme+song+piano+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463528/normal_5fa3ca9630c21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_5fa748548bce1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f9d19886eed4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5f88f0922628b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_5f90a7471affc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448731/normal_5fa5e5a30394f.pdfIn PDF document text
    • https://pivamaxisogen.weebly.com/uploads/1/3/4/4/134481881/4449361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f980b6810409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f8e5c527ce52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380691/normal_5fa5f63138254.pdfIn PDF document text
    • https://mumetepelexax.weebly.com/uploads/1/3/4/4/134461787/b496e6fb01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5f872b5692b12.pdfIn PDF document text
    • https://rutedidatares.weebly.com/uploads/1/3/4/4/134490949/setiti_lorot_belatosuboro_togakotiniratip.pdfIn PDF document text
    • https://lotunepopufuro.weebly.com/uploads/1/3/4/7/134712327/tafipexujasosof_bedekogu_fejemasevate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wilugugo/ranalulibomafujejelade.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 5436 bytes
SHA-256: 0a4d1268d4cb610fb712be5a803e4353baac8b30b4700e7c1d88a590e5b74b47
font_01_sfnt_off00010e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7B 10476 bytes
SHA-256: a3802966210a8e6f0e0280f519d4689d489392329f1ad1c18d3b6fd9173f8c88

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