Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f3484c2fce58ef…

MALICIOUS

PDF

69.7 KB Created: 2020-12-29 10:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 963468c3d395e8cc026aefb10e91b86f SHA-1: 184335d18782bbe54523835d2f6e1dd696298b5b SHA-256: d6f3484c2fce58ef9753b3933e76d1d725e52a4d6f37803f6bb8aeb296422efc
186 Risk Score

Malware Insights

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

This PDF document has been flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The presence of a URL with a 'utm_term' parameter indicates a potential tracking or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and extensive URL obfuscation are indicative of malicious intent, likely to redirect users to phishing sites or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/strik?utm_term=chocolate+bar+recipe+coconut+oil PDF link annotation
    • https://teduruperalugo.weebly.com/uploads/1/3/4/3/134320262/8723832.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/9823159.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/e7cc2.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/kenexazo.pdfIn PDF document text
    • https://tamatopufav.weebly.com/uploads/1/3/4/3/134386909/c336de5.pdfIn PDF document text
    • https://gegivibubijob.weebly.com/uploads/1/3/4/5/134507206/9326953.pdfIn PDF document text
    • https://korebamo.weebly.com/uploads/1/3/0/7/130739662/vigizosokegewota.pdfIn PDF document text
    • https://vefawedufuzagi.weebly.com/uploads/1/3/4/7/134718770/gofosufeduvuvin_rupewerepu.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/gozedifatos.pdfIn PDF document text
    • https://suxaposalepet.weebly.com/uploads/1/3/4/6/134677753/3069193.pdfIn PDF document text
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/9627990.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/kelukakeb/23704004087.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/tafaxevemewezid.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_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 4888 bytes
SHA-256: f7b5288f3a6b841697bb260f01b7414b25294c8d17506f4e4d92875c7992593b
font_01_sfnt_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 10880 bytes
SHA-256: f17dc6460b12212949d25e4bcf70690a0fe0e340bc082873cba52925ac7878e9

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