Malicious PDF — malware analysis report

Static analysis result for SHA-256 391e26de4b535d8d…

MALICIOUS

PDF

57.0 KB Created: 2020-04-16 01:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d6744150a3767469dcfa5de81fe2a54f SHA-1: ed9f8284b8e5c579da1433451c03bd40ba64ba4f SHA-256: 391e26de4b535d8db3559407852730fef2f12c710d309ff8923a417d2f134372
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to these external resources, which could host further malicious content or be part of an SEO poisoning scheme.

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://pinkdoorprop.com/uploads/1/3/0/3/130379610/130379610.html#reporting+accuracy+sensitivity+specificity
    • http://kentsvenson.com/uploads/1/3/0/6/130639698/ec1388.pdf
    • http://laryssachan.com/uploads/1/3/0/3/130323600/kugulevekuru.pdf
    • http://kebenterprisesllc.com/uploads/1/3/0/2/130272363/6015782.pdf
    • http://timbercreeklogging.com/uploads/1/3/1/3/131382018/newojafelenete-nefoxorux-jinovo-wusuzula.pdf
    • http://informationsystemdynamics.net/uploads/1/3/0/4/130488493/50c04c284.pdf
    • http://kingleekrepairshop.com/uploads/1/3/0/4/130491179/6747619.pdf
    • http://sunshinefloral.org/uploads/1/3/1/4/131453603/badbf8.pdf
    • http://ellamatesic.com/uploads/1/3/0/2/130289676/zalutabobigox-bituxarabegime.pdf
    • http://southcrestuniversityministry.org/uploads/1/3/0/5/130588885/nomaxax-rifar.pdf
    • http://kjsdeli.org/uploads/1/3/0/5/130550967/mamufufugola-dadida.pdf
    • http://nobhillvintageboutique.com/uploads/1/3/1/3/131380447/tetosejunok-nakejim-koganabej.pdf
    • http://electusyoutheducation.org/uploads/1/3/0/7/130776298/e291c14f8.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_off0000a14e.bin
7747136a049d16c451e7f06cbee1102cbffb8923855dd66891f49ec75b33380d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA14E 8752 bytes
font_01_sfnt_off0000c2cf.bin
1dcf038e283d4bd91f2b552ca914238ce543f13dee0f564575aec5285d42efe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CF 16040 bytes

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