Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81db3de9f9a7c14…

MALICIOUS

PDF

37.6 KB Created: 2020-04-21 02:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d4f77db641c4bf688bd831fdaeec2e31 SHA-1: ead7b29af2a04be174678f1916de2dcb9e7655e4 SHA-256: b81db3de9f9a7c14eb6fd49a2eb347bf6da966d1a503d599f67e1b62d1a454a5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files on various domains. This suggests a link farm or SEO poisoning tactic to drive traffic to potentially malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external links is a strong indicator of a malicious lure.

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://ashtoninsuranceagents.com/uploads/1/3/1/6/131606268/131606268.html#greek+latin+roots+worksheets+middle+school
    • http://softechinc.net/uploads/1/3/0/8/130814861/d1460f2df558.pdf
    • http://mountainreveriemassage.com/uploads/1/3/1/4/131454950/vofigixazabekug.pdf
    • http://integratedapproachhealing.com/uploads/1/3/0/3/130313340/zerotevoraweso.pdf
    • http://genesisautoca.com/uploads/1/3/0/5/130539768/kelorob.pdf
    • http://waggintailsfun.com/uploads/1/3/0/2/130288532/88b1f14fb32cdcc.pdf
    • http://businessoglivsglede.com/uploads/1/3/1/6/131636692/2155923.pdf
    • http://judithstowell.com/uploads/1/3/1/3/131383981/vadesifumewo.pdf
    • http://bestcosmeticdentistlasvegas.com/uploads/1/3/1/1/131163931/1011484.pdf
    • http://asrmt.com/uploads/1/3/0/7/130740200/9347287.pdf
    • http://lifelongstrongjobs.com/uploads/1/3/0/2/130273738/bexaxi-jevumitego-xejunupijelixu-gumakitanozaviz.pdf
    • http://rachelkellismiller.com/uploads/1/3/0/6/130604981/mimor_nisatukar_tonodufaxo_gokorok.pdf
    • http://natuerlich-im-gleichgewicht.com/uploads/1/3/1/1/131164097/weded.pdf
    • http://jobarex.com/uploads/1/3/1/3/131383624/51a64180.pdf
    • http://abeyart.com/uploads/1/3/1/3/131383562/29c5f71.pdf
    • http://hillsidehelpinghands.com/uploads/1/3/0/6/130639611/rolodosami.pdf
    • http://rachelkellismiller.com/uploads/1/3/0/6/130604981/mimor_nisatukar_tonodufax
    • 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_off00006932.bin
24b407025e6b188d10ce4d4a0d935759d83c37895f371f4adb68475e525c2ddd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6932 8028 bytes

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