Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cd1d6ab638eb92…

MALICIOUS

PDF

52.6 KB Created: 2020-03-30 14:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2f88e213687319bc71afaedb178fa9ab SHA-1: 242a1713f4504d1d04a8edeb29eee587798480fa SHA-256: 66cd1d6ab638eb9250035eb71d36f814aa6187f2a776741490d01c8b605cfee9
136 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs pointing to various PDF files on different domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links aligns with techniques used for SEO manipulation or to host further stages of an attack. No scripts were extracted, but the document body and heuristics suggest a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://amazingjourneytravel.voyagerwebsites.com/uploads/1/3/0/7/130776381/130776381.html#sole+of+foot+parts
    • http://theproccast.com/uploads/1/3/0/2/130287965/zavefuxi-misuwedi.pdf
    • http://overload.shop/uploads/1/3/0/2/130270974/kejagukil-seguvemijujeb.pdf
    • http://bybuttertrade.com/uploads/1/3/1/4/131438310/degidumuko.pdf
    • http://berkeleybeast.com/uploads/1/3/0/3/130379210/pevig.pdf
    • http://visiblegreenhouse.com/uploads/1/3/0/5/130550985/jemabu_fugupu_wofenakuzetip_dadizowineliwur.pdf
    • http://fumblydiddles2.com/uploads/1/3/0/9/130969322/dinirono.pdf
    • http://tigermoonyoga.org/uploads/1/3/0/5/130588201/3210101.pdf
    • http://gainstorming.org/uploads/1/3/0/7/130776367/tumet_mobugomat_tazokisexifizo.pdf
    • http://precisionsprayparts.org/uploads/1/3/0/6/130605206/cd93ace4b057.pdf
    • http://getoilywithdane.com/uploads/1/3/1/0/131070456/cdec8.pdf
    • http://salvationhouse.ru/uploads/1/3/0/5/130588168/b25dd5629dd2.pdf
    • http://didakton.org/uploads/1/3/0/4/130476203/kubamisamitepuzix.pdf
    • http://victoryhealthcarepartners.com/uploads/1/3/0/9/130969072/wutodufumokaseb.pdf
    • http://yourprettycool.com/uploads/1/3/0/4/130488121/9404663.pdf
    • http://clevelandchamberchoir.com/uploads/1/3/0/4/130477135/4787200.pdf
    • http://macabreitaliangregrounds.com/uploads/1/3/0/7/130775220/nikogavituvilo.pdf
    • http://wastenotmakers.com/uploads/1/3/0/5/130540525/907524d.pdf
    • http://buildwithbrittany.com/uploads/1/3/0/6/130620674/resageweputuwufati.pdf
    • http://vaservicesltd.com/uploads/1/3/0/7/130738951/suwokurosomujej.pdf
    • http://paradiselawngarden.com/uploads/1/3/1/3/131383427/lijudomaj.pdf
    • http://graceplacecalvary.org/uploads/1/3/0/5/130588943/afa4705fd2505e.pdf
    • http://theproccast.com/uploads/1/3/0/2/130287965/zave
    • 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_off0000a41b.bin
5ae765b80cb149b69dcf9854d06426243f0d291d940ac21fec090a242d51162f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA41B 8500 bytes

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