Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e522977ef326aa…

MALICIOUS

PDF

39.9 KB Created: 2020-03-30 13:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 07e9874467d399e05e433b09e5dd6d89 SHA-1: c15b9c30d4fe4ce64c52acdd6c27a21c4045d116 SHA-256: 57e522977ef326aab094efac3b0a8ceca6600e6b3deaea0597b64bd1bf09b2fd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, many of which point to other PDF files with numeric or book-like slugs on various domains. This pattern is indicative of a link farm or SEO abuse technique, likely intended to drive traffic or host malicious content. The ML classifier strongly supports the malicious verdict, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

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://annotalegal.com/uploads/1/3/0/5/130550838/130550838.html#deslocamento+de+equilibrio+quimico+resumo
    • http://casinopromotionconsultants.com/uploads/1/3/0/5/130540453/romav-lobon-lagisaf-kanajasup.pdf
    • http://matthew-s-williams.com/uploads/1/3/0/7/130776043/kudurinoto-larosuzetiz-buvividipon.pdf
    • http://bandobelts.ca/uploads/1/3/0/5/130550972/bukitezunazago.pdf
    • http://maturelady.vip/uploads/1/3/0/7/130739816/vogogowogekibevi.pdf
    • http://fixitrightcomputing.com/uploads/1/3/1/3/131382673/7143748.pdf
    • http://mail.funkythai2go.com/uploads/1/3/0/3/130323554/nanimibewowezeg.pdf
    • http://openclosetshops.com/uploads/1/3/0/5/130588509/348c74.pdf
    • http://supermakr.com/uploads/1/3/0/4/130476804/sabitukuxuxi.pdf
    • http://savannahcountertops.com/uploads/1/3/0/9/130969435/sonunonezi.pdf
    • http://judithjack.com/uploads/1/3/0/3/130323249/joligi.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_off00006727.bin
407e088a83fe73fd3d7a24df7332551d5b1a90560c47000da12adcceae2011bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6727 9592 bytes
font_01_sfnt_off000086dd.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86DD 2652 bytes

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