Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd5bac5371435a0…

MALICIOUS

PDF

37.5 KB Created: 2020-03-07 16:00:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4015d50b88e0a91ed4ff5a4019c70792 SHA-1: d4a5fe547a9c1ed3f360dd92c0c9a01ceda0faae SHA-256: 5bd5bac5371435a06d0de1f68c911548e33b10cf4d2e562adbe327bf44679ece
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm designed to distribute content or phish users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content or phishing pages.

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://entrepreneurssuccessformula.com/uploads/1/3/0/6/130639848/130639848.html#addie+model+book+pdf
    • http://rmxelite.com/uploads/1/3/0/3/130379192/8b55a1b30785.pdf
    • http://www.nambemillhouse.com/uploads/1/3/0/2/130271143/ec833.pdf
    • http://irishknucklesmma.com/uploads/1/3/0/7/130775174/2182719.pdf
    • http://fleabayers.com/uploads/1/3/0/6/130639304/pikosuvutuk-noxeseraro-zogejekorugopit-pejabogifakogev.pdf
    • http://nathanchizenreviews.com/uploads/1/3/0/6/130604181/1547484.pdf
    • http://planaustral.com/uploads/1/3/0/7/130775309/tevofepupix.pdf
    • http://warriorempath.com/uploads/1/3/0/6/130639592/monaga.pdf
    • http://belquiszahir.com/uploads/1/3/0/6/130604653/bowoxo.pdf
    • http://www.pressurewashpearland.com/uploads/1/3/0/6/130639148/3669149270e635.pdf
    • http://iboyinteractive.com/uploads/1/3/0/5/130550982/sinalepupe.pdf
    • http://thoughtcoalitionhq.com/uploads/1/3/0/3/130379331/4721677.pdf
    • http://msvieirasclassroom.com/uploads/1/3/0/6/130604769/2831000.pdf
    • http://mascotsofrockford.com/uploads/1/3/0/4/130483810/datapopafulotij_nibenunufatu_sopokiduwazoku_fepakod.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_off0000686f.bin
7db5b25b7c090c839b671ad069b900ed2bc2028534d8c354ef24ded6155c8d3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686F 8104 bytes

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