Malicious PDF — malware analysis report

Static analysis result for SHA-256 151f47c054d32179…

MALICIOUS

PDF

42.1 KB Created: 2020-04-28 18:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eefd0b9587a48b9b8c864b75172f7961 SHA-1: c09cdd15acb010174bda1a46df4d9e64e786f7a9 SHA-256: 151f47c054d321793bb87cd0b6ad3fe8e389d1de12ed4582c8c1c911ba200d36
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by an ML classifier as malicious and contains a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The document body, though partially corrupted, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware distribution.

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://johnymoore.com/uploads/1/3/0/4/130491181/130491181.html#free+brain+teaser+worksheets+for+middle+school
    • http://dezignkulcha.com/uploads/1/3/0/6/130604848/tezejebarav.pdf
    • http://bp2020.run/uploads/1/3/1/4/131407958/e11fdf69ceec9ea.pdf
    • http://mymcpa.com/uploads/1/3/0/6/130621047/rujus.pdf
    • http://11bvideos.com/uploads/1/3/0/6/130604295/e936d85a6086.pdf
    • http://universitytools.org/uploads/1/3/0/5/130542912/4435282.pdf
    • http://oursafespace.net/uploads/1/3/1/3/131381302/jekukapupunasem-vukesaxopiw.pdf
    • http://forkliftprotraining.com/uploads/1/3/0/2/130288599/473e44de.pdf
    • http://salgadosgourmet.net/uploads/1/3/1/0/131070490/4270657.pdf
    • http://northamericantransmissionfl.com/uploads/1/3/0/5/130539125/9d684bc3ed5bf8f.pdf
    • http://loanswithcorey.com/uploads/1/3/0/2/130271126/gusunepaza.pdf
    • http://sjlandscapingmaintenance.com/uploads/1/3/0/2/130288439/fikamoxudapalodajig.pdf
    • http://marypacern.com/uploads/1/3/0/3/130323510/tibeletorivud.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_off00007cac.bin
923111358688745fdcfeed5c80170f32e0558d7cfdd0a62fe44918b78483cdfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAC 8084 bytes

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