Malicious PDF — malware analysis report

Static analysis result for SHA-256 263af507a1241bb2…

MALICIOUS

PDF

43.9 KB Created: 2020-03-20 14:26:13 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 21b773cc872828d732756f271939f0d4 SHA-1: a6d6a23929494ef334ea0634eb8b945bd77f54eb SHA-256: 263af507a1241bb2ea6f60794db99eccba7e30091060e20f5f6dd6cf7333abcc
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files on different domains. This pattern is indicative of a link farm or SEO abuse technique, often used to distribute malicious content or generate traffic. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body is largely unreadable binary data, but the presence of numerous external links is the primary indicator of malicious activity.

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://katiaponomareva.com/uploads/1/3/0/7/130739308/130739308.html#juegos+de+coordinacion+para+ni%C3%B1os+educacion+fisica
    • http://orbitvetmap.net/uploads/1/3/0/4/130435518/498de4261263.pdf
    • http://www.minneapolis-organizing.co/uploads/1/3/0/3/130379743/2765971.pdf
    • http://courtbernstudios.co.za/uploads/1/3/0/8/130874162/1629221.pdf
    • http://charlton-estates.co.uk/uploads/1/3/0/7/130738837/voxaxalek.pdf
    • http://lanceslaton.com/uploads/1/3/0/7/130776641/fasonun.pdf
    • http://www.abetterworldorganization.org/uploads/1/3/0/2/130289305/5797235.pdf
    • http://kelseyleonofficial.com/uploads/1/3/0/8/130813837/bidumitaxutalopefu.pdf
    • http://www.chopzeechop.com/uploads/1/3/0/5/130590482/mejalu.pdf
    • http://mail.legitimatemarry.com/uploads/1/3/0/5/130548192/9793873.pdf
    • http://www.jtstore679.net/uploads/1/3/0/5/130540823/70c1c28b1.pdf
    • http://norcaltaxi.net/uploads/1/3/0/7/130740193/6178b3d005.pdf
    • http://nusgss.org/uploads/1/3/0/6/130604026/petakumi.pdf
    • http://www.mykbzkitchen.com/uploads/1/3/0/7/130739810/4a6854520.pdf
    • http://bedbugjournal.com/uploads/1/3/0/4/130476039/tufajevamenax_povajojaniku.pdf
    • http://www.collinscandys.com/uploads/1/3/0/6/130620290/6552781.pdf
    • http://atlantaposscn.org/uploads/1/3/1/0/131070170/5540925.pdf
    • http://organic-marijuana.net/uploads/1/3/0/5/130541065/3518988.pdf
    • http://moniquesdreamsounds.com/uploads/1/3/0/5/130590716/6e5f1c207d1b.pdf
    • http://personalinjurylawyer-calgary.com/uploads/1/3/0/2/130270775/beketebubonagup_sojovuxeni_fisuso_siganile.pdf
    • http://mail.lizamoscatelli.com/uploads/1/3/0/7/130739206/rogopob.pdf
    • http://www.lascazuelaslouisville.com/uploads/1/3/0/7/130775048/fiwefod.pdf
    • http://jobs-inside.com/uploads/1/3/0/8/130874516/2421d.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_off00007f2c.bin
e0b4b7075a7dbe8b35e6e2933faf5bf7a74501c1e5118c95eb05150bdba36288		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2C 9068 bytes

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