Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3a8cc1f25e4d61…

MALICIOUS

PDF

51.4 KB Created: 2020-04-02 04:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fa9a4bb05bb2de5f27998991cb553391 SHA-1: 13c2e00be28596456549df9b465c80aa8ac92df5 SHA-256: 0b3a8cc1f25e4d614a3446a809be3ed38c1a9eaa0e264316b86a89bfc396b449
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files with numeric slugs, indicating a link farm or SEO spam operation. The document body, though partially corrupted, contains text related to 'fascitis plantar' and references the wkhtmltopdf tool, suggesting a deceptive lure. The ML classifier strongly flagged this PDF as malicious, and the heuristic for a PDF link farm further supports this assessment.

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://greyday5k.com/uploads/1/3/1/4/131407226/131407226.html#que+es+fascitis+plantar+y+porque+se+produce
    • http://ridgenapaautoparts.com/uploads/1/3/0/5/130588625/riwusukij.pdf
    • http://finleyriverfrozentoes.com/uploads/1/3/0/9/130968956/10ddddd1ef35a.pdf
    • http://mma-society.com/uploads/1/3/0/4/130483239/4769846.pdf
    • http://titanofficefurniture.com/uploads/1/3/0/4/130435641/bolazofekujotokewone.pdf
    • http://hwangchris.com/uploads/1/3/0/2/130288924/dizidejuf-nilazev.pdf
    • http://standforkind.com/uploads/1/3/0/7/130739315/rubedula.pdf
    • http://erdydesign.com/uploads/1/3/1/3/131380969/1730285.pdf
    • http://mystrugglemyvictory.com/uploads/1/3/0/8/130813834/8576938.pdf
    • http://cathystronach.com/uploads/1/3/0/6/130604682/zepekivu.pdf
    • http://msharrisfirstgrade.com/uploads/1/3/0/7/130775244/falisamin_dunitogu_gufajililut.pdf
    • http://beatricecloakefineart.com/uploads/1/3/1/4/131482926/kefelo.pdf
    • http://clipsla.com/uploads/1/3/0/5/130545021/338112.pdf
    • http://iavnt.net/uploads/1/3/0/7/130775106/fizuj.pdf
    • http://safehairdye.org/uploads/1/3/0/6/130605476/6fa8a4ffca36.pdf
    • http://icreatestudio.org/uploads/1/3/0/5/130589135/9993162.pdf
    • http://benisselester.com/uploads/1/3/0/2/130272600/8737247.pdf
    • http://graywolfmedia.org/uploads/1/3/0/7/130776486/5588161.pdf
    • http://mcclennywoodhousehauling.com/uploads/1/3/0/4/130488964/0f551.pdf
    • http://nexacreativeconsulting.com/uploads/1/3/1/3/131384211/4553599.pdf
    • http://crowninglotus.com/uploads/1/3/0/7/130739046/lixuti.pdf
    • http://cultivateoats.com/uploads/1/3/0/7/130776341/14b7c281f5f44.pdf
    • http://tapworkstavern.com/uploads/1/3/1/1/131163872/2725435.pdf
    • http://riverdalerenovations.ca/uploads/1/3/1/4/131413766/zuzomozaturuz_senikoj_kofuvowoz_jilodipo.pdf
    • http://levelten.shop/uploads/1/3/1/0/131070559/381544.pdf
    • http://josiahdholt.com/uploads/1/3/0/5/130551185/bobarizud.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_off0000a03b.bin
46c05bd28554c6618912f4ceb52255def86f2959f0d6b70a0a99f88fec0983d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA03B 8560 bytes

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