Malicious PDF — malware analysis report

Static analysis result for SHA-256 a410bd9eed070b66…

MALICIOUS

PDF

36.4 KB Created: 2020-04-11 10:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f0ebaff38155fdb5d881a04e09716cba SHA-1: f96ec75af47452ee68b123624ff345d344cf82f6 SHA-256: a410bd9eed070b6688c5b97b7869d38016094ef970f2be9c960d4bfc2639b413
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF SEO Link Farm' heuristic. The embedded URLs point to various domains, suggesting a tactic to drive traffic to potentially malicious or spam content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted from this sample.

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://rebeccalaplacaattia.com/uploads/1/3/1/1/131164113/131164113.html#pretty+little+liars+flawless
    • http://sturminsternewtonplan.com/uploads/1/3/1/4/131454052/rifulikewakodu_motaduje_juvujefepuje_kebemada.pdf
    • http://kabongs.org/uploads/1/3/0/9/130969990/vekumixik-sazaxabume.pdf
    • http://kalekim.nl/uploads/1/3/1/4/131455275/degepuxonan.pdf
    • http://saraillana.com/uploads/1/3/1/4/131406288/2d0849d7c22aa.pdf
    • http://neuroconference.org/uploads/1/3/0/5/130543173/8724103.pdf
    • http://quattroports.com/uploads/1/3/0/6/130620695/1651158465c849.pdf
    • http://improveed.org/uploads/1/3/1/4/131453100/8212612.pdf
    • http://endtimesinamerica.org/uploads/1/3/1/4/131453256/vewekupuviwug.pdf
    • http://citins.com/uploads/1/3/1/3/131398493/9437771.pdf
    • http://kxrproperty.com/uploads/1/3/0/4/130478160/vewivedo.pdf
    • http://bsmfarms.com/uploads/1/3/1/4/131437349/050754437d7d3.pdf
    • http://maryellengabriel.com/uploads/1/3/0/2/130270897/foginob.pdf
    • http://citins.com/uploads/1/3/1/3/13139849
    • 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_off00006726.bin
1118cfdb7eb4a4615c4a8bf4d0c963e8667b5edcad0f40f6fb629ba2f2fb4c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6726 7932 bytes

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