Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55e87b2979b7bc8…

MALICIOUS

PDF

37.7 KB Created: 2020-03-20 13:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f4207de8d35287187657ccdbfb0f723d SHA-1: c0199ffc6b15669fcd4815cec9246f05924a76e7 SHA-256: e55e87b2979b7bc87ed031da0b1e689f43fda435a88b2079673f6e136a48c094
94 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, with numerous external URLs embedded within its body. The primary heuristic firing, PDF_SEO_LINK_FARM, indicates a mass of external links, suggesting a deceptive tactic to drive traffic to potentially malicious sites. The ML classifier strongly supports the malicious verdict. The document body contains text fragments and URLs, reinforcing the attack pattern of directing users to external resources.

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://hkcfoundationforparkinsons.org/uploads/1/3/0/6/130639037/130639037.html#reset+dish+receiver
    • http://agentforwriters.com/uploads/1/3/0/9/130969045/nolin.pdf
    • http://www.view4k.com.au/uploads/1/3/0/8/130814397/5663383.pdf
    • http://dcooley497.com/uploads/1/3/0/5/130590763/jubuv.pdf
    • http://express1shipper.com/uploads/1/3/0/5/130588195/de50480370.pdf
    • http://leslegendes.net/uploads/1/3/0/6/130620965/457eabb9c.pdf
    • http://jackrogersart.com/uploads/1/3/0/8/130813025/5145127.pdf
    • http://2925industrial.com/uploads/1/3/0/5/130588222/bariku_rorivetokek.pdf
    • http://grantownmuseum.org/uploads/1/3/0/6/130640132/2550021.pdf
    • http://wealthtacos.com/uploads/1/3/0/6/130622025/sizexulite.pdf
    • http://piccadillygh.com/uploads/1/3/0/3/130324065/fa34e4b.pdf
    • http://productiveproductcreation.com/uploads/1/3/0/6/130621279/jowimoseseriw.pdf
    • http://hoodoohealing.net/uploads/1/3/0/5/130590265/pepadekodaxog_rokuxe_kilajesotal_legaselital.pdf
    • http://deanjamesmusic.com/uploads/1/3/0/3/130379118/naporumadan-ruxureremason-ruretawokofobo-gugiduxemavo.pdf
    • http://cooparch.net/uploads/1/3/0/3/130312923/tuwomafani.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_off00006b88.bin
5da4e6318d9e8850dfeec15f4d0e506d91bde3df65412cc76c8a1a3f09f2a837		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B88 7892 bytes

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