Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c770aeca962341…

MALICIOUS

PDF

43.1 KB Created: 2020-04-16 14:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3094f2a542bf5326fef920ce2274e52b SHA-1: 12336d6c767ceb4516e1b309ab060d9b9c1bc1fa SHA-256: f2c770aeca9623417ca6dc382a513c14c2b87e8e8c329974f8c5bae9453a9e0c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though heavily obfuscated, contains text related to 'Christmas card template eyfs' and mentions the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious content or redirection. The primary attack pattern involves directing users to a large number of external URLs, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trucktwistlocks.com/uploads/1/3/0/3/130323415/130323415.html#christmas+card+template+eyfs
    • http://tkxpressions.com/uploads/1/3/0/6/130621393/busidaketo_zuvifexaf_pojes_rezefinenofo.pdf
    • http://valleybikecommute.com/uploads/1/3/1/4/131438579/6656291.pdf
    • http://goremotors.net/uploads/1/3/0/9/130969819/19919800645.pdf
    • http://stephspensleydesigns.com/uploads/1/3/0/6/130620728/b27c00d8d.pdf
    • http://fotohat.com/uploads/1/3/0/6/130621569/1442927.pdf
    • http://angelamaxfield.com/uploads/1/3/0/2/130288511/fadisulu.pdf
    • http://russiantobealangevin.com/uploads/1/3/0/8/130813453/megawiza-suvorexixazefo.pdf
    • http://robledobg.com/uploads/1/3/0/8/130873710/9555340.pdf
    • http://remiddelalderdager.com/uploads/1/3/1/4/131453022/f927dd64.pdf
    • http://fulcruminventive.com/uploads/1/3/1/1/131163902/wexukon.pdf
    • http://priscaspiggies.com/uploads/1/3/1/3/131383482/8113076ec.pdf
    • http://samgravitte.com/uploads/1/3/0/6/130604993/459b0db7c3.pdf
    • http://scenichillvacations.com/uploads/1/3/1/3/131379590/dodekovalakedokun.pdf
    • http://firsttrinityhh.net/uploads/1/3/0/6/130604979/fadesefenuxogo.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008500.bin
1418804aa5d5693a57f4d5f04a61523e956b4a87ddf413f6fc3656bc0c24a23d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8500 6792 bytes

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