Malicious PDF — malware analysis report

Static analysis result for SHA-256 57587d2f3544f197…

MALICIOUS

PDF

52.5 KB Created: 2020-03-20 10:51:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c811823612d3cbebefe8c0954c0d6a86 SHA-1: a530acfa281878a452d12526fb59b263e8a4cc09 SHA-256: 57587d2f3544f1979871d4cb1eb854956779ff0ff37fb3fa24ec0c157f2ca283
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are dynamically generated and point to other PDF files. This behavior is indicative of a link farm or SEO spam technique, likely intended to drive traffic or host malicious content. The document body's title, 'Important phrasal verbs for bank pdf', is a lure to encourage users to interact with the embedded links.

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://bobbysmobilebar.com/uploads/1/3/1/0/131070567/131070567.html#important+phrasal+verbs+for+bank+pdf
    • http://inkasisa.net/uploads/1/3/1/1/131164034/bekuwetezad-gozisujevomigug-sixesevagetuwo.pdf
    • http://www.lclcgermantown.org/uploads/1/3/0/7/130776607/a5b5f1bb4.pdf
    • http://webdisk.rrrca.org/uploads/1/3/0/4/130483584/ligizijomazu.pdf
    • http://mx.brattleborocjc.org/uploads/1/3/0/2/130274330/9927644.pdf
    • http://mindhealth-center.com/uploads/1/3/0/6/130639526/53234.pdf
    • http://benchmarklawnservices.com/uploads/1/3/0/7/130739635/tabefesulurexuzujo.pdf
    • http://vinochef.com/uploads/1/3/0/3/130324011/fopusisufudopojapuzo.pdf
    • http://www.authenticleak.com/uploads/1/3/0/2/130288378/824945.pdf
    • http://www.adanphu.com/uploads/1/3/0/8/130814597/2368236.pdf
    • http://nshs.northsmithfieldschools.com/uploads/1/3/0/4/130477420/bimibeked-xowesisejafinef-sisok.pdf
    • http://onlinesmdc.com/uploads/1/3/0/6/130605471/c8b2cb.pdf
    • http://sweetwillowsoap.com/uploads/1/3/0/5/130588843/mosumabifarus-nutujojek.pdf
    • http://mta-sts.mx.ramofcny.com/uploads/1/3/0/5/130590312/mozow.pdf
    • http://christinawei.com/uploads/1/3/0/6/130603761/9511889.pdf
    • http://rockandrollroadshow.com/uploads/1/3/0/5/130588360/6443995.pdf
    • http://newhavenmo.com/uploads/1/3/0/5/130590108/2eabad7b.pdf
    • http://libertycitizen.com/uploads/1/3/1/0/131070227/mogimowemejokazujume.pdf
    • http://bonniebitz.co.uk/uploads/1/3/0/5/130550663/3909185.pdf
    • http://tsjmanagement.com/uploads/1/3/0/2/130271211/1732476.pdf
    • http://ocaboosterclub.org/uploads/1/3/0/6/130621903/fimoniziru.pdf
    • http://therockbridgeport.com/uploads/1/3/0/5/130542977/f6aad2.pdf
    • http://www.merryleetraum.net/uploads/1/3/0/7/130775395/dojisapafemozod_zugaji.pdf
    • http://dogsaflying.com/uploads/1/3/0/5/130546803/bapuw.pdf
    • http://neuroimmunekids.org/uploads/1/3/0/6/130603878/e931cffd.pdf
    • http://www.jdsexteriors.ca/uploads/1/3/0/5/130539319/fe49bc3844cd8.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_off0000a29b.bin
25573c8011ce3d297e20e6ea0c2865456b9f5c080d38929a90c3ac912b284ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA29B 8168 bytes

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