Malicious PDF — malware analysis report

Static analysis result for SHA-256 f216d09614dde928…

MALICIOUS

PDF

35.0 KB Created: 2020-03-09 08:08:12 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e1ff623caa2a8558ba493f7f494e0de3 SHA-1: 75c5e280a615561e50b0713139abd79318bf81ff SHA-256: f216d09614dde92893587712e9d819bd35633c91c53b5de7edd5453dd592bd77
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious. The document body contains text related to song chords and PDF metadata, but the primary malicious activity appears to be the distribution of external links.

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://richkane.biz/uploads/1/3/0/3/130323612/130323612.html#another+brick+in+the+wall+1+chords
    • http://mocommunitytrees.com/uploads/1/3/0/7/130775916/fesusu.pdf
    • http://cloverbend.com/uploads/1/3/0/6/130621443/9211322.pdf
    • http://pinktopia.org/uploads/1/3/0/8/130813965/kebutupisi.pdf
    • http://togethermedialtd-sandbox.net/uploads/1/3/0/3/130324385/zukikalezikarizalir.pdf
    • http://www.alifeonawhim.com/uploads/1/3/0/6/130605396/vutalimojavimul.pdf
    • http://endlessarttattoostudio.com/uploads/1/3/0/7/130775504/5933922.pdf
    • http://www.yourpacetours.com/uploads/1/3/0/5/130590548/kenilolopirupu.pdf
    • http://nononsensehomeinspection.com/uploads/1/3/0/6/130621267/2dd916b6ad01c8.pdf
    • http://mustardgreen.net/uploads/1/3/0/6/130639810/4330143.pdf
    • http://www.godtsamspill.com/uploads/1/3/0/2/130289756/1549900.pdf
    • http://nataliejimenez.com/uploads/1/3/0/6/130603887/lupifit.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_off000060f7.bin
c41c036386efaec6f159c2aaf504ecc6fd27e7017cae565d49c58a240ed404ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F7 7664 bytes

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