Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac1b9e5663e52e2…

MALICIOUS

PDF

56.1 KB Created: 2020-04-23 18:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dd07fdcf4ff4f6db6385086139a3813c SHA-1: c617b1a88908419b0baec45ccba98265aad89bb2 SHA-256: fac1b9e5663e52e297f42f506379eb2f28037929f91f049ca5b3cfdecf339a32
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to PDF files hosted on various domains. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, suggesting the document is designed to drive traffic to these external resources. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a reference to a 'free html email footer template', which is likely a lure to disguise the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dmcswim.ch/uploads/1/3/0/5/130550787/130550787.html#free+html+email+footer+template
    • http://alexandercranewriter.com/uploads/1/3/1/4/131454373/gumawogekelim.pdf
    • http://ltspropertyservices.com/uploads/1/3/0/3/130313513/3802629.pdf
    • http://southpawsportsperformance.com/uploads/1/3/0/8/130873907/lubomoniwafusigefug.pdf
    • http://tourbillonart.com/uploads/1/3/0/4/130476978/dadad3.pdf
    • http://alandreth.com/uploads/1/3/1/4/131407357/ed4206ddbe48f.pdf
    • http://simplyamazingtours.com/uploads/1/3/0/2/130292007/a368a901f7d5.pdf
    • http://ccontrerasdesigns.com/uploads/1/3/0/7/130775050/1386197.pdf
    • http://sjcconsulting.org/uploads/1/3/0/5/130547812/b6314.pdf
    • http://tinycatskitchen.com/uploads/1/3/1/6/131606491/9635481.pdf
    • http://awaytravel17.com/uploads/1/3/0/7/130739396/lawupokakefetumemusi.pdf
    • http://unexpectedgrace.org/uploads/1/3/0/5/130540280/dufizanonabos.pdf
    • http://brownallyear.kiwi/uploads/1/3/1/4/131454719/4e6cb46da51fbb6.pdf
    • http://fulcruminventive.com/uploads/1/3/0/4/130483510/jagamasafuta_vusukeruruxe_gerobimikipizi_nesojuguluzoxib.pdf
    • http://southpawsportsperformance.com/upload
    • 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_off0000b46d.bin
373619e0e1b5bee1aecb78f582f5fd289677d3656e14794b519969a3072f2b5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB46D 8308 bytes

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