Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0783cea8e724d33…

MALICIOUS

PDF

68.2 KB Created: 2020-11-23 12:08:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5081b76941497b21def774dbfae549bf SHA-1: 8113b901ff8eccbdb3a13f9de64611e68bbfe5ab SHA-256: c0783cea8e724d33f9aede24843d48b5661546af2ca52bd701d9d7c4f38a94be
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to S3 buckets with PDF files, suggesting a link farm or SEO poisoning attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download an archive and provides a password for it, a common tactic to hide malicious payloads from initial scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/strik?utm_term=gta+san+andreas+zip+file+download+fo PDF link annotation
    • https://gotumofavi.weebly.com/uploads/1/3/4/6/134602885/dijuxala-sukirema-wusiporagase-rekemon.pdfIn PDF document text
    • https://numurivigafezu.weebly.com/uploads/1/3/4/3/134390613/zomomubob.pdfIn PDF document text
    • https://tozijaletaxe.weebly.com/uploads/1/3/4/3/134312516/miwitas-donesodu-pegiku.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/zakunafu/79473756507.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/gekosewegorinetidukade.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/high_elf_rogue.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/vokukibofokoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/45744204814.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/87347376329.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/array_concept_in_c.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/94351928350.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_off0000ce00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 5208 bytes
SHA-256: 08bf6f3f35e5a01101db331f407bc603af72719ffe16c5684638fea42e8178f4
font_01_sfnt_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 10700 bytes
SHA-256: ceefc50ee46dad8869749d5dfe0b3fee6c2e7637f32c1e396a184c01136d4a2e

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