Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb1812346f31037…

MALICIOUS

PDF

60.6 KB Created: 2020-04-09 14:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 92f46a8ddb5b5ae70224aa8a850fe973 SHA-1: 7004f444a0ba65fb253ba2852caaaa15c3c0265e SHA-256: 5bb1812346f310372428757c1194e02ff5f442d909a5d475cdb5c8268bd32cc4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of external links and the PDF structure indicate an attempt to redirect users to potentially malicious content, likely as part of a phishing or spam campaign.

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://joyallison.net/uploads/1/3/0/6/130620492/130620492.html#como+dibujar+ojos+reales
    • http://lenorebeeson.com/uploads/1/3/0/6/130604977/4624777.pdf
    • http://homerestorationsrva.com/uploads/1/3/0/9/130969170/mimebobipogigig-lonoviwiden-sifekokikufef-zarevu.pdf
    • http://zedcranes.com/uploads/1/3/0/5/130545001/kalixeximalesomagu.pdf
    • http://ramrina.org/uploads/1/3/0/2/130288602/litosemepuzujim.pdf
    • http://armadanamedsound.com/uploads/1/3/0/5/130588267/8682991.pdf
    • http://allentxcarpetcleaning.com/uploads/1/3/0/7/130740066/2e6ed6fffc075b.pdf
    • http://campinabox.camp/uploads/1/3/0/6/130605015/saposanil-wosopu-dovababavevapo-fonanatavisog.pdf
    • http://cleanadog.com/uploads/1/3/1/4/131438528/45e5f8c6034.pdf
    • http://mslichfield.com/uploads/1/3/0/5/130550778/julotinedotesudowo.pdf
    • http://ccmaid.com/uploads/1/3/0/4/130483286/bivexoguxuti.pdf
    • http://studiosoundart.com/uploads/1/3/0/5/130539244/dumuruvuxit_xemevolaram_dojadetovutibir_jiberupupale.pdf
    • http://highwealdshepherdhuts.com/uploads/1/3/0/5/130588658/6d1dd866.pdf
    • http://implicit7.net/uploads/1/3/1/4/131437173/vuduboxugawuvozude.pdf
    • http://thefitgirls365.com/uploads/1/3/0/7/130739287/zodekosije.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_off0000c463.bin
543f00a96df6d556c70bd151d3f0e0d34c3d7614a4eae2b0aa5261e9bd5d5c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC463 8624 bytes

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