Malicious PDF — malware analysis report

Static analysis result for SHA-256 e642f2952ed55b75…

MALICIOUS

PDF

34.5 KB Created: 2020-06-11 18:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edd82e0a1462fd391be138cb817da372 SHA-1: 16966d31eb3b7ae67137f9169971973da4c9e6c1 SHA-256: e642f2952ed55b7516e7341a680aa82656b5fea336050bb0633c8182cee11149
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains references to a service manual and the authoring application, suggesting a lure. The primary attack pattern involves directing users to a vast array of external PDF files hosted on numerous domains, likely for SEO spam or to distribute further malicious content. No scripts were extracted from this sample.

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://ciaopin.com/uploads/1/3/0/5/130589124/130589124.html#yaesu+ft-1000mp+service+manual
    • http://vinyasahouse.com/uploads/1/3/0/2/130287279/a1deea7c69de.pdf
    • http://607.bpmtc.com/uploads/1/3/0/6/130620551/rilejewekadon.pdf
    • http://shopheartodixieboutique.com/uploads/1/3/0/6/130604539/07c759ab296.pdf
    • http://moriahgracephotography.com/uploads/1/3/1/4/131409621/jolowof-sarisedan-jimuvawume.pdf
    • http://mta-sts.chrissieparker.com/uploads/1/3/0/9/130969946/vodugara.pdf
    • http://trusted-realty.com/uploads/1/3/0/6/130621909/tatomunufobe.pdf
    • http://thegoodchew.com/uploads/1/3/1/4/131438164/d3c6fa.pdf
    • http://bahamasaugustllc.com/uploads/1/3/1/4/131410939/9773237.pdf
    • http://mta-sts.adara.org/uploads/1/3/0/7/130775291/susojufezu-punonudezis-nurovijeg.pdf
    • http://hostmaster.nibbanawellness.com/uploads/1/3/0/7/130775291/4bd433.pdf
    • http://samantha-jayne-coaching.com/uploads/1/3/1/4/131437637/8948657.pdf
    • https://wuzavigen.files.wordpress.com/2020/06/69673238064.pdf
    • https://ninosunixen.files.wordpress.com/2020/06/renosefipurubajidosur.pdf
    • https://zitosodav889642648.files.wordpress.com/2020/06/malesoxulixexanudinope.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_off00005c59.bin
94b472edc47d50ee500eeb704fc90d64a1edc92d6767345731cb2cb1c9aad1f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C59 10084 bytes

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