Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f465374cacd2bdf…

MALICIOUS

PDF

40.3 KB Created: 2020-04-01 16:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dccd9b698aedb133ee26ab882d1cee3d SHA-1: 6a5fb6da91a1ffb2ae287d3deec750d6451ed87c SHA-256: 3f465374cacd2bdf8657f79f908104c2fbae2ca0979f1a1bd86d273fea5c632f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO spam campaign, designed to drive traffic to potentially malicious sites. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the extensive link farm suggests the primary goal is redirection.

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://livetoconnectministries.org/uploads/1/3/0/4/130479123/130479123.html#operaciones+con+fracciones+2+eso+ejercicios
    • http://whitemanwaking.com/uploads/1/3/0/5/130551073/8ed2aaa.pdf
    • http://rightmixstrip.com/uploads/1/3/0/4/130477310/sagulakofus.pdf
    • http://servicemycity.com/uploads/1/3/0/2/130271224/tagoredidujini_jejaduda.pdf
    • http://brookebabble.com/uploads/1/3/1/3/131379815/rixukamijudalij-gisatelebakewaf.pdf
    • http://kochlogisticsretail.com/uploads/1/3/1/4/131483488/9648183.pdf
    • http://apismellifera2.com/uploads/1/3/0/7/130775606/safimi.pdf
    • http://thrivedrillingtools.com/uploads/1/3/0/8/130874535/8963b65c1e4a77.pdf
    • http://lemondeunlimited.com/uploads/1/3/0/8/130813694/bupudobuvig-susafuweteda.pdf
    • http://myforgottenself.com/uploads/1/3/1/0/131069738/1128232.pdf
    • http://nicholassearle.com/uploads/1/3/0/7/130776452/dulizojakato_gugesudije.pdf
    • http://drlaurensterner.com/uploads/1/3/0/2/130270897/vasisov.pdf
    • http://southlandgun.net/uploads/1/3/0/6/130621588/gagajanimun-lamobogori-gidonan.pdf
    • http://asaferme.com/uploads/1/3/0/5/130543134/razeduw.pdf
    • http://sharonmclendon.com/uploads/1/3/0/8/130814247/bavobedawewudabox.pdf
    • http://aaalaw.us/uploads/1/3/0/2/130288579/4500958.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_off000070b5.bin
8ed15c7adf175b0d62e6337f1614e6d8d7c00db8e521bb0045d047d7c9b86f62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B5 9316 bytes

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