Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31ef5eb24443926…

MALICIOUS

PDF

41.8 KB Created: 2020-03-15 08:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: de9fc5621bc505222891eec0ad0da21b SHA-1: e002d91eb5b2bde73b0afc6b613dc225d98625d9 SHA-256: e31ef5eb244439265f2449f9c254e896ccd6ead3ff83f4d363db08da4e0afeef
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated but appears to contain references to software and metadata, possibly as a lure. The primary attack pattern involves directing users to numerous external URLs, which could host further malicious content or be part of an SEO spam campaign.

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://www.mayahairstonpoetry.com/uploads/1/3/0/6/130603958/130603958.html#arcsoft+collage+creator+1.+0+free
    • http://mojopix.net/uploads/1/3/0/6/130621488/zopinizoxa.pdf
    • http://mx.blackhawkpipesanddrums.org/uploads/1/3/0/2/130273893/mevanetumafuxavig.pdf
    • http://mindraym5.radiologyequipmentstore.com/uploads/1/3/0/6/130639558/e0f85.pdf
    • http://the-eternal-sun.com/uploads/1/3/0/5/130550796/8739180.pdf
    • http://gotmyhealr.com/uploads/1/3/0/6/130621328/varabifapaxe.pdf
    • http://www.lerboristadelconsorzio.com/uploads/1/3/0/2/130270885/acb5f9.pdf
    • http://alyssaperryinteriors.com/uploads/1/3/0/6/130620420/mumedadu_rurexulujujo_siwuzel_xujosu.pdf
    • http://cnppilotshop.com/uploads/1/3/0/4/130435672/838fe93e9041.pdf
    • http://www.tbergmoser.com/uploads/1/3/0/2/130272472/4384311.pdf
    • http://ego.com.co/uploads/1/3/0/5/130538840/libefutawoxaruw.pdf
    • http://merlene.ca/uploads/1/3/0/6/130605335/1139870.pdf
    • http://www.garylrohr.com/uploads/1/3/1/0/131070147/sifugaliveze.pdf
    • http://www.mrschick.com/uploads/1/3/0/7/130738956/kubixomi.pdf
    • http://nosborne.com/uploads/1/3/0/6/130639100/d06a0214b8e0922.pdf
    • http://wcgreen55.com/uploads/1/3/0/8/130813373/bff3136ab86.pdf
    • http://michelle-endoflifedoula.com/uploads/1/3/0/6/130620998/1145046.pdf
    • http://equitytradinglabs.org/uploads/1/3/0/7/130738928/dece648c173a1.pdf
    • http://carterracing83.com/uploads/1/3/0/2/130287284/guvig.pdf
    • http://talaldaoud.com/uploads/1/3/0/3/130379294/1414844.pdf
    • http://www.tennisphysio.com.au/uploads/1/3/0/7/130775144/3682105.pdf
    • http://performancefoam.ca/uploads/1/3/0/9/130969465/monidusapidax.pdf
    • http://synapse-productions.com/uploads/1/3/0/4/130483650/37ab6f583.pdf
    • http://www.tflowmusicgroup.com/uploads/1/3/0/7/130739893/kizubo_zazunubapis_bever_roguxabel.pdf
    • http://activehomebuyersllc.net/uploads/1/3/0/7/130775461/c83dc1b08e714b8.pdf
    • http://www.swarnayug.org/uploads/1/3/1/0/131071038/5e64b9e8566b0.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_off000078d0.bin
3736bbcb9bcb61765383158f121b8d1557897fd9a3a2d26aec409fc9e3e3dfee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D0 8428 bytes

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