Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4f51b969d2069b…

MALICIOUS

PDF

44.7 KB Created: 2020-04-12 05:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 31aa32784cf4ef9dd955ea99a40cedc8 SHA-1: ef3e12cfd1dcb0165b90ec2a7c2de03f3ab55ae1 SHA-256: ef4f51b969d2069b1e59d07cf344b42ee7af2a86e9c385c303f14fa9146f054d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or traffic redirection scheme. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text and a reference to the wkhtmltopdf tool, suggesting it was programmatically generated for SEO purposes.

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://vocesemergentes.net/uploads/1/3/0/4/130435930/130435930.html#estilo+indirecto+de+literatura
    • http://valleyofthesundesigns.com/uploads/1/3/1/4/131413275/tunifivunenojijo.pdf
    • http://nicolejzimmer.com/uploads/1/3/0/8/130813998/6010485.pdf
    • http://teameffortnetwork-spray-vitamins.com/uploads/1/3/0/6/130621280/ziturajuli.pdf
    • http://trophybearer.org/uploads/1/3/0/5/130542692/49fe6a040230f5.pdf
    • http://amikas.ch/uploads/1/3/0/6/130620959/8159570.pdf
    • http://easeosteo.com/uploads/1/3/0/2/130288406/giliruxi-pulaleli-kaziwifevibevo-kanagoz.pdf
    • http://snkgng.com/uploads/1/3/1/3/131398530/5067187.pdf
    • http://li-xiaolu.com/uploads/1/3/0/5/130588257/1517287.pdf
    • http://dailydivine.org/uploads/1/3/0/4/130476594/legafolivadarivil.pdf
    • http://realtyrunners.com/uploads/1/3/0/9/130969061/misadojilipaso-sijovabagemetuf-fekixofarujod-xusoguxixajeti.pdf
    • http://mfdive.com/uploads/1/3/1/1/131164011/fazazuxawi.pdf
    • http://rwbsj.net/uploads/1/3/0/7/130775104/c9ef699a.pdf
    • http://musicmanbuilding.com/uploads/1/3/0/6/130604543/0084d1761fc4.pdf
    • http://mikerutherford4sheriff.com/uploads/1/3/0/4/130435548/6174400.pdf
    • http://basiliols.com/uploads/1/3/0/8/130874612/90cf9cdcf06ac70.pdf
    • http://mfdive.com/uploads/1/3/1/1/131164011/fazaz
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007139.bin
a464dad30c03672f3d0ff2adfc9f3ca551c6b0378fb64b2cc25cf25c35845459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7139 9112 bytes
font_01_sfnt_off000091b1.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91B1 16036 bytes

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