Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebf1790652e44cd…

MALICIOUS

PDF

39.5 KB Created: 2020-03-16 16:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 321c49742fd0b439de00d9ee814dfdc0 SHA-1: c3ffd9ab6d7beccfa71fdcb508e4148e4ac80475 SHA-256: 1ebf1790652e44cdb0d4579d833f075505294f4fb1e238ad66de8358f1eb9009
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to grammatical parts of speech and references the wkhtmltopdf tool, suggesting a lure document. The primary function appears to be acting as a link farm, directing users to numerous other PDF files hosted on various domains.

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://bejustalittlebetter.com/uploads/1/3/0/3/130323754/130323754.html#partes+de+las+oracion+gramatical
    • http://www.claire-and-mike.com/uploads/1/3/0/7/130739185/gufewotabemunu-kinakolaj-nosaselud-lunoja.pdf
    • http://www.gouniqueboutique.com/uploads/1/3/0/8/130873932/xipevurodobonilof.pdf
    • http://secure.printmunkey.com/uploads/1/3/0/9/130969131/jefumetojakugipoj.pdf
    • http://maintainyourgains.com/uploads/1/3/0/7/130739419/sirejewiwepom.pdf
    • http://publicnou.com/uploads/1/3/0/6/130604069/vovowu.pdf
    • http://smpt1.warnerfinancialgroup.com/uploads/1/3/0/5/130539758/48fb9c3a53c17.pdf
    • http://naughtonsandblastinggalway.com/uploads/1/3/0/5/130588769/wajupetojufatan.pdf
    • http://slpresource.com/uploads/1/3/0/8/130873996/482f3ab39a906e.pdf
    • http://www.hqaccounting.co.uk/uploads/1/3/0/3/130379529/vewab-jojixe.pdf
    • http://www.billmaus.com/uploads/1/3/0/5/130550655/5a08a98c47ad94.pdf
    • http://kyrafoster.com/uploads/1/3/0/6/130605116/7420529.pdf
    • http://seattleprenatalmassage.com/uploads/1/3/0/7/130740141/kewubenakebafo.pdf
    • http://www.insidedmc.com/uploads/1/3/0/7/130738814/dopuxalotaz.pdf
    • http://opera.hfullerton.com/uploads/1/3/0/3/130323717/juvef_jejofa_sutoxuvi.pdf
    • http://futsal415.net/uploads/1/3/0/8/130874567/duxaril-sovutodajodeti.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_off000070e9.bin
4db432d8d1ee905b7001834bee00e2eae2fa2f02c4c6af9bebf4eb55e58984ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E9 8360 bytes

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