Malicious PDF — malware analysis report

Static analysis result for SHA-256 646712b4b4acef23…

MALICIOUS

PDF

32.9 KB Created: 2020-05-14 16:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ca489d8d5b3b53a1d609dc8e90ee1bd SHA-1: c956e8b3d70c2c1df32f4956db165860b3af4279 SHA-256: 646712b4b4acef232676064bc2062567367157b0c255d1a5e4b5a9cfd1716f9d
96 Risk Score

Malware Insights

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

This PDF file contains a mass of external links, many of which point to other PDF files on unrelated domains. The heuristic PDF_SEO_LINK_FARM indicates a link farm, suggesting the primary purpose is to manipulate search engine results or distribute content via a large number of seemingly unrelated sites. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent, likely related to SEO spam or potentially distributing further malware.

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://glassguysauto.com/uploads/1/3/1/0/131070674/131070674.html#lagu+lily+koplo+alan+walker
    • http://bodyandmind-pilates.com/uploads/1/3/0/6/130621213/dbb313a.pdf
    • http://riyasnails.net/uploads/1/3/0/8/130873927/guvujepawizil-sotav.pdf
    • http://calverdemov.com/uploads/1/3/0/6/130620998/2b5da7e37aa2.pdf
    • http://pinheadsquilting.net/uploads/1/3/0/5/130539913/mipub_bozifolokavosam_semujakisapurav.pdf
    • http://belock.org/uploads/1/3/0/6/130620926/benepediw.pdf
    • http://trailsendgear.com/uploads/1/3/1/0/131070792/3988402.pdf
    • http://neatnorthwest.com/uploads/1/3/1/0/131070202/8234631.pdf
    • http://hvv-denderleeuw.be/uploads/1/3/0/6/130621701/6e83b62d2.pdf
    • http://necroscape.com/uploads/1/3/1/3/131383977/foritikegivop_lamujuduf_budige_tiwugegin.pdf
    • http://bluedreamhawaii.shop/uploads/1/3/0/4/130435569/jevaziw.pdf
    • http://sharepowder.com/uploads/1/3/0/5/130590458/ad603e36b7.pdf
    • http://tourfuture.net/uploads/1/3/0/9/130969876/wimewun.pdf
    • http://knightsofsolomon764.org/uploads/1/3/0/7/130775677/058d724f29.pdf
    • http://clarkcountyisnotforsale.com/uploads/1/3/0/7/130776157/xoxik-xodow-gutagulusog-jenudaduluz.pdf
    • http://lethuyquetoi.com/uploads/1/3/0/6/130603944/eaf54d144438598.pdf
    • http://kxxvii.com/uploads/1/3/0/8/130813136/2891444.pdf
    • http://wanderingteuchter.com/uploads/1/3/0/2/130271148/9021715.pdf
    • http://amyephdcmsp.com/uploads/1/3/0/6/130604696/c39c0d7c.pdf
    • http://ygautos.com/uploads/1/3/1/3/131398128/4121015.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005688.bin
d12c6500282689cad761ac2ff56c9c8c072334945a62367fa2dc671282d54266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5688 9716 bytes

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