Malicious PDF — malware analysis report

Static analysis result for SHA-256 821a3b99892f3a60…

MALICIOUS

PDF

35.5 KB Created: 2020-05-04 13:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 84ca57c6ee7b85281f3f83ff00dea9ff SHA-1: e80c932290355df539ebfccdc66ca7e61a016f7b SHA-256: 821a3b99892f3a60072db0a4f54ab4b18d9645e39daac5b6068ead5d67598676
104 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to other PDFs with numeric slugs, indicating a link farm or SEO manipulation tactic. The 'SE_DOWNLOAD_BUTTON' heuristic suggests a call-to-action, likely to encourage clicking these links. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a malicious workflow, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amaris-designs.com/uploads/1/3/0/6/130639936/130639936.html#calling+card+background
    • http://danielapolito.com/uploads/1/3/0/5/130539842/notesopik.pdf
    • http://lartderecycler.com/uploads/1/3/1/3/131398113/36c8d4.pdf
    • http://mashamgallery.com/uploads/1/3/1/4/131483126/jizagureju-juzaxomagatixe-jatifebutumuw-wadetibu.pdf
    • http://lavecinadivina.com/uploads/1/3/0/5/130540926/rowub-leker.pdf
    • http://nicetynecessities.com/uploads/1/3/0/6/130603782/9431db.pdf
    • http://dataoffashion.com/uploads/1/3/0/2/130272081/124914.pdf
    • http://perspectivesinhumanservices.com/uploads/1/3/0/4/130476348/3e4f224329013.pdf
    • http://teamschoolreview.com/uploads/1/3/1/4/131437623/tubobujikuri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00005fa6.bin
21f4e1cafeddea5ede5aff3a7e5db2bc7084f9a48086b9b3685f4b666e14c36a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA6 10856 bytes

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