Malicious PDF — malware analysis report

Static analysis result for SHA-256 74cd7542f2485971…

MALICIOUS

PDF

36.5 KB Created: 2020-06-01 14:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65a1681d9343f713ade94abb59f9dd11 SHA-1: 02bddeef3350fd152f06a6df7d5cb5460908c4dd SHA-256: 74cd7542f24859711de16c58cfe3e2f704813397ddd45c44164e1481f1c855b6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO spamming technique, often used to distribute malicious content or to obscure the true destination. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is not benign. The presence of URLs like http://luziwiderblau.de/uploads/1/3/0/7/130776055/130776055.html#winrar+free+download+full+version+64 suggests a lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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 http://luziwiderblau.de/uploads/1/3/0/7/130776055/130776055.html#winrar+free+download+full+version+64
    • http://ambitwinteam.com/uploads/1/3/0/8/130873771/lawudinadaredotol.pdf
    • http://genesysrealtygroup.com/uploads/1/3/0/7/130776423/vetewufusapun_jidux.pdf
    • http://kidsofghanafoundation.com/uploads/1/3/0/5/130588936/lezagibopibidamu.pdf
    • http://stphilipstheevangelist.org/uploads/1/3/0/5/130550809/86cd4ef.pdf
    • http://chilcofoods.com/uploads/1/3/0/7/130776678/dajakaze.pdf
    • http://luziwiderblau.de/uploads/1/3/0/7/130776055/terms.html
    • http://luziwiderblau.de/uploads/1/3/0/7/130776055/dmca.html
    • http://luziwiderblau.de/uploads/1/3/0/7/130776055/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://xibelilunaf.files.wordpress.com/2020/05/murelosalu.pdf
    • https://nepumoja.files.wordpress.com/2020/05/mexofavakoluvuzoveli.pdf
    • https://dudixefusef.files.wordpress.com/2020/05/zupive.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005793.bin
6f3cd43294f935b12ed10ea0b7ca1584a0bb6bab74cd3aace506d81aecb92309		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5793 21008 bytes

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