Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ec79467bc04b18…

MALICIOUS

PDF

44.7 KB Authoring application: Soda PDF
MD5: 96cc0c3940734d114414c0c9aa1ced21 SHA-1: f13cc152c53b15f5e92202bc127dfebc0cbc47d7 SHA-256: 41ec79467bc04b18355973c3affbfd071cbff5fe714b7f75eceaf56393c32feb
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The PDF_SEO_LINK_FARM heuristic identified a large number of embedded external links pointing to other PDF files hosted on various domains. The document body contains text related to 'Missguided plus review' and delivery methods, suggesting a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://momnovel.com/uploads/1/3/0/7/130738567/losuwirokix.pdf
    • http://trickhorse.net/uploads/1/3/0/5/130547116/6205420.pdf
    • http://alixxpartners.com/uploads/1/3/0/5/130543170/8277949.pdf
    • http://drberrycoaching.com/uploads/1/3/0/5/130551222/6034171.pdf
    • http://balance-buddies.com/uploads/1/3/0/6/130640220/wolegum.pdf
    • http://ocmunc.com/uploads/1/3/0/2/130272862/xitezenibulamivob.pdf
    • http://mwmbg.org/uploads/1/3/0/4/130483616/5d1e17f02cd17.pdf
    • http://killhost.ru/uploads/2020/01/28/4740319.pdf
    • http://canyonman.org/uploads/1/3/0/6/130621980/dakopi-retasezota-vovulijababiwi.pdf
    • http://myentouragemusic.com/uploads/1/3/0/2/130270945/130270945.html#missguided+plus+review

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011f3.bin
280a7af8fce0d1ebff1b56f34e920430838192c5dec0c46d37c986534a3b66c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3 9336 bytes

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