Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec5552d629d137e…

MALICIOUS

PDF

66.3 KB Created: 2020-12-14 22:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4e403ad8815ab3a05e55f333e959a9a2 SHA-1: 9d9f79dd3a35bd54c6f00ed060229cef2a02c21d SHA-256: 6ec5552d629d137e6c4f92dc99aee53313b50534915fd896ce1edae06116751d
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to free software, aligning with phishing or scam tactics. The presence of many external links points towards a link farm used for SEO manipulation or distributing malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=free++bluetooth+app+for+windows+7 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_5f95c436c5b4a.pdfIn PDF document text
    • https://tatilimaju.weebly.com/uploads/1/3/4/4/134464449/2428c29e479432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5f91025771974.pdfIn PDF document text
    • https://gozobamo.weebly.com/uploads/1/3/4/7/134714837/48ac8c82d6a15b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478132/normal_5fb9c548eb7a1.pdfIn PDF document text
    • https://nutakofo.weebly.com/uploads/1/3/4/8/134894975/losetofek_gitogefokif_zosatisidorid.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/8ce06e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381788/normal_5f92f257875c1.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/nevovumowa/manorama_epaper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/is_phen375_safe.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/80774414973.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/kamegopagifix.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/vuziw.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/contrarian_investing.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/gajanuvupeja.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/zopojabanatoxapepezup.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_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 5396 bytes
SHA-256: 01c70faa15b7be7cc90ebb1a3235b655a069093895b571e85d0ead9c35dc9fc4
font_01_sfnt_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 10400 bytes
SHA-256: 509b3bf415ab364ea304676a12c2d7229dfa53efeb5ef6446a8b5e9ea98a304f

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