Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0c56c17e31ee59…

MALICIOUS

PDF

40.6 KB Created: 2020-03-10 14:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d1c6ae31b2769411fe8d8c7aeef53ab1 SHA-1: 71c73e7c0d24e0981cadb54d6696450e3a238795 SHA-256: dc0c56c17e31ee5949b5b422e45619134b0c6ac94cb5a95862c657f9d4e00270
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, many of which are dynamically generated and point to unrelated domains, indicating a link farm or SEO spam tactic. The document body, though partially corrupted, contains text related to 'Treatment for hepatitis b in nigeria' and the wkhtmltopdf application, suggesting a lure to attract users to these malicious links. The ML classifier strongly flagged this PDF as malicious.

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://hotelvic-phase2-ko.devsite-1.com/uploads/1/3/0/5/130539218/130539218.html#treatment+for+hepatitis+b+in+nigeria
    • http://www.surfergirl.us/uploads/1/3/0/7/130738903/suzelurabe.pdf
    • http://www.helmbeauty.com/uploads/1/3/0/3/130323803/6bc62ff.pdf
    • http://myluriyubodyscrubs.com/uploads/1/3/0/6/130639082/juduwomef-muvesiradu-dobudubuxodi.pdf
    • http://mta-sts.smtp.wbrental.com/uploads/1/3/0/7/130739980/rifavagezadev.pdf
    • http://learnganow.com/uploads/1/3/0/7/130740412/rabesom.pdf
    • http://mta-sts.mail.bigdoglabradoodles.com/uploads/1/3/0/7/130740060/kakusolavobela.pdf
    • http://www.elopementco.com/uploads/1/3/0/5/130590496/zutoxurapeposepe.pdf
    • http://mta-sts.kudsvetisava.org.rs/uploads/1/3/0/4/130483318/ritexulovitebol_rolidisup_delali.pdf
    • http://mywilshiremanning.com/uploads/1/3/0/7/130775181/vinixagumanozub.pdf
    • http://perfectproofediting.com/uploads/1/3/0/6/130621506/01f54ea6bcb2062.pdf
    • http://ruthwildwood.com/uploads/1/3/0/4/130476722/6852189.pdf
    • http://fashiontrendingstyles.com/uploads/1/3/0/5/130590153/malaxepusizadarivud.pdf
    • http://mercurydeliveryinc.com/uploads/1/3/0/6/130621503/fijudaviwute.pdf
    • http://todo-method.com/uploads/1/3/0/2/130289308/535293.pdf
    • http://fastmoneymovie.com/uploads/1/3/0/2/130288317/4db1ac7f0f8ce.pdf
    • http://rd-autobrokers.com/uploads/1/3/0/7/130739986/felasojuwoxekava.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_off0000755f.bin
ea120a99e2caf172aae0a80415f30a3dee483dfeb40780709020021161e4526e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755F 8216 bytes

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