Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1a10acc9107c09…

MALICIOUS

PDF

62.6 KB Created: 2020-11-12 20:33:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: acb4adcb67e28632d640fbd750491393 SHA-1: 215cab850c146e4fe2c48cba2e628809b1c79be7 SHA-256: ce1a10acc9107c0939bb9224301c93d55eafa08bf68c621c04e4ee3667ba8f80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://traffset.ru/strik?utm_term=refining+precious+metal+wastes+by+c.m.+hoke PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383295/normal_5f9e097654949.pdfIn PDF document text
    • https://mujonutuxow.weebly.com/uploads/1/3/4/3/134336111/tanawatarenodes.pdfIn PDF document text
    • https://sekamaxe.weebly.com/uploads/1/3/4/5/134590712/5057228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f877119e5da9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_5f996720eef3f.pdfIn PDF document text
    • https://dodawuwaxa.weebly.com/uploads/1/3/4/3/134305805/5052eb712e08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f8731c654554.pdfIn PDF document text
    • https://sipasegeremiraf.weebly.com/uploads/1/3/4/4/134404187/378808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_5f9eaad57ddf0.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/681701e1bb51.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/mozilapi-sedodipu.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/bededuxotulapil/15876276586.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/55087944259.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/talozawunatifobamilidet.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_off0000b7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F2 5864 bytes
SHA-256: 03783705e8410da6f702a3e23fc0a9588745e61e7665a263a770d5d7799ddde1
font_01_sfnt_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 9768 bytes
SHA-256: 5b12a54dc80f56cd471c4984461fff9ae220a54b414f4f55d69e9375473fe7ed