Malicious PDF — malware analysis report

Static analysis result for SHA-256 53946c3355bb05d3…

MALICIOUS

PDF

138.4 KB Created: 2020-03-31 09:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f3e3a5f30e52fdf02a4aaff393cb74d1 SHA-1: 562d87e99e844f1f17b35d2edbd3026d61ca41a1 SHA-256: 53946c3355bb05d3736bd9b531bc191bee44c9aaf8ec06818bc027ca4fcbd5fa
94 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 are numerically or generically named PDFs, suggesting a link farm or SEO manipulation tactic. The document body text, though partially corrupted, contains the phrase 'Programas de escuela sabatica 2013 en power point', which is likely used as a lure to attract users to click on the embedded malicious URLs. No scripts were extracted, and the primary malicious activity appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://blueridgebrittleco.com/uploads/1/3/1/3/131380087/131380087.html#programas+de+escuela+sabatica+2013+en+power+point
    • http://xrmsoft.com/uploads/1/3/0/6/130604515/2515509.pdf
    • http://cenefer.com/uploads/1/3/0/7/130739629/4000275.pdf
    • http://colorguardlove.com/uploads/1/3/1/1/131164278/4bbdadf9.pdf
    • http://canadians.cool/uploads/1/3/0/2/130272474/siforikazuzopuletes.pdf
    • http://petradiamondsetting.com/uploads/1/3/0/7/130776356/pepewuna.pdf
    • http://mckaysearthmoving.com/uploads/1/3/0/5/130540049/zanus-zakiwinosatunog-dudenosad-sezolevexiv.pdf
    • http://americanagrofood.com/uploads/1/3/0/6/130604419/monumoxekarok-tesipile-wimiduderawamub.pdf
    • http://adarebuildingandhardware.com/uploads/1/3/0/3/130323424/nonix.pdf
    • http://travelingnurses1.com/uploads/1/3/0/6/130639776/xatogurepo-fexukunibabosu.pdf
    • http://trulycowgirl.com/uploads/1/3/0/4/130483429/6254682.pdf
    • http://ramweedhuis.com/uploads/1/3/0/4/130476873/9053968.pdf
    • http://stfrancisresourcectr.org/uploads/1/3/0/2/130270740/ac9312cd03c0.pdf
    • http://resumeonpar.com/uploads/1/3/0/6/130621715/ludidowikuto.pdf
    • http://rangjungtibetanmedicine.com/uploads/1/3/0/6/130639675/peludifexafato_petemeb_ravorototu.pdf
    • http://konrn.com/uploads/1/3/1/4/131437670/zokanoka-zogizagekusi.pdf
    • http://retroupholstery.com/uploads/1/3/0/5/130551229/48bd3735e.pdf
    • http://joyofstress.com/uploads/1/3/0/2/130291635/9246501.pdf
    • http://chimimundo.net/uploads/1/3/0/4/130478057/kafuvof.pdf
    • http://celebrationsbyakilah.com/uploads/1/3/0/7/130738917/wisipatalukotu_jerovexitegeji_jitozowaj.pdf
    • http://ghnormande.com/uploads/1/3/1/1/131164308/6030075.pdf
    • http://newmexicolegalhelp.com/uploads/1/3/0/5/130588435/3392598.pdf
    • http://photomepro.com/uploads/1/3/0/7/130775821/c248087adbf4.pdf
    • http://jewelditson.com/uploads/1/3/0/5/130588594/8bedb59342.pdf
    • http://imagelawnservice.com/uploads/1/3/0/5/130543467/99017b3d.pdf
    • http://wallmusiclessons.com/uploads/1/3/0/8/130814176/1481141.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ebe4.bin
b095009e1aa7b679086a2dd093949a1e2bfdfa179c83d9e64a20210f199a406d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBE4 1544 bytes
font_01_sfnt_off0001f355.bin
640db62c34c3f4db243c567e0ada6e80f2933f2761a273c941ccc81005b2cb2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F355 10464 bytes

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