Malicious PDF — malware analysis report

Static analysis result for SHA-256 41533f637a99e36d…

MALICIOUS

PDF

40.7 KB Created: 2020-04-05 13:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 22dbf4d8c2cb78addc59e496e127d69c SHA-1: 269eba84b65561d89f2fa3480ca7db7333ca6ef9 SHA-256: 41533f637a99e36d310b083208f97a4c41bcf1ea0ae75a98b367903a1663fd28
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The document body contains a title related to physics, likely a lure to disguise the malicious intent of directing users to a network of potentially malicious PDF documents.

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://jackchildsyoga.com/uploads/1/3/1/4/131407236/131407236.html#ecuacion+itinerario+movimiento+rectilineo+uniforme+acelerado
    • http://alyaqtha.com/uploads/1/3/0/9/130969057/tiridik.pdf
    • http://kalyncorstanje.com/uploads/1/3/0/6/130621084/de053211e2ef4.pdf
    • http://nicolemreyes.com/uploads/1/3/1/3/131398036/zuxagexiwalabilelo.pdf
    • http://massagelogicspa.com/uploads/1/3/1/0/131070591/1117568.pdf
    • http://wowbrows.net/uploads/1/3/0/5/130540453/tuvegabekaxe.pdf
    • http://awaken2mindfulness.com/uploads/1/3/0/5/130539888/7534711.pdf
    • http://brooklyn-grace.com/uploads/1/3/0/5/130539758/00c8a19acb.pdf
    • http://gardenandgrainssoapcompany.com/uploads/1/3/0/6/130604351/6735474.pdf
    • http://humanitiesandtechnologyreview.com/uploads/1/3/0/6/130621011/45386a8b95fe9ed.pdf
    • http://castandblastidaho.com/uploads/1/3/0/5/130542996/f0c53cf3a17a3f.pdf
    • http://uptomore.com/uploads/1/3/0/5/130588822/kefenofomaz-vijadisuse-kotaxojozalax-rowugivofijabe.pdf
    • http://gigilemon.com/uploads/1/3/0/8/130814120/7782251.pdf
    • http://curerecords.net/uploads/1/3/0/5/130543840/9351723.pdf
    • http://abadiademinerva.com/uploads/1/3/0/7/130739153/japujikurikadixo.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_off00007368.bin
832ac5485bb28f092eb465bc8f1679b57b902b0662722e85bb730e4a1eff7dfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7368 8604 bytes

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