Malicious PDF — malware analysis report

Static analysis result for SHA-256 09253f37b9d2a9cf…

MALICIOUS

PDF

40.0 KB Created: 2020-04-10 04:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 46711c6dd8585391d995eb47dc3b4006 SHA-1: d48dcf72deb2eda390d407eda652d2130a41d12a SHA-256: 09253f37b9d2a9cff0078643089793477bd0b883fceaca86b90c6781ed094397
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file exhibits characteristics of a link farm or SEO spam, with a large number of embedded external URLs pointing to various domains. The primary heuristic firing indicates a 'PDF_SEO_LINK_FARM' with numerous external PDF links, suggesting an attempt to manipulate search engine rankings or redirect users to potentially malicious content. The ML classifier strongly supports the malicious verdict.

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://spikedscoops.com/uploads/1/3/0/5/130588997/130588997.html#6.5+grendel+reloading+handbook+download
    • http://wordsofasmalltowngirl.com/uploads/1/3/0/6/130604730/wojopenodaxowiro.pdf
    • http://redteamblue.com/uploads/1/3/1/0/131071249/gupivar-raxewo-xifivesut.pdf
    • http://sweetspiritinc.com/uploads/1/3/0/2/130292014/wenokobuzul.pdf
    • http://lakegastonview.com/uploads/1/3/0/7/130740187/4b245155085.pdf
    • http://pfma.net/uploads/1/3/0/3/130379163/metisuwezobajujiru.pdf
    • http://rawgoldsinc.com/uploads/1/3/0/9/130969190/913343.pdf
    • http://makewavesviolinandviola.com/uploads/1/3/0/6/130604638/7757371.pdf
    • http://westskagitcert.org/uploads/1/3/0/6/130620430/6373871.pdf
    • http://caldwellsfuneralservice.com/uploads/1/3/0/2/130289784/92fd43889f6.pdf
    • http://megabitpazari.com/uploads/1/3/1/4/131408008/pumino-jazulelima.pdf
    • http://thebeadstop.com/uploads/1/3/0/5/130538956/27dec5c.pdf
    • http://veteranhillhops.com/uploads/1/3/1/4/131484029/kuvoge.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069c3.bin
7c0f8e8047034073f4850d7c21f589bb41afe5712482fdc43cfe9ad94a82d844		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C3 8260 bytes
font_01_sfnt_off0000899d.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x899D 2616 bytes

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