Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec5502aba165d28…

MALICIOUS

PDF

54.4 KB Created: 2020-03-21 19:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a669d71b86dc8c907c52fdac981edf8 SHA-1: 39d689d6d69416d1d4c1acd08e2d425fd35be8d5 SHA-256: fec5502aba165d28b023730eb10434088887aee6e589caf949b8660b5c8bb599
94 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which point to PDF files with numeric or generic slugs, suggesting a link farm or SEO manipulation tactic. The document body itself is largely unreadable but contains a URL that is also present in the list of external links. The primary attack pattern appears to be directing users to a multitude of external sites.

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://myersmindset.com/uploads/1/3/0/6/130604125/130604125.html#juegos+para+trabajar+en+equipo+ni%C3%B1os
    • http://menlorealestate.net/uploads/1/3/0/7/130775472/5313465.pdf
    • http://classroomsnotcells.com/uploads/1/3/0/6/130604640/1e7c675b5f7.pdf
    • http://aquaenergyllc.com/uploads/1/3/0/9/130969608/kisojemot_mojuvu_junin.pdf
    • http://milvueltastejidos.com/uploads/1/3/0/7/130776447/xawitet_wiwuxopuwuv_bifopadobara.pdf
    • http://massagesearchmarketing.com/uploads/1/3/0/8/130874339/4466294.pdf
    • http://bakedwithlove.net/uploads/1/3/0/6/130620522/sawim_matagovowifada_fizewut.pdf
    • http://bearversusbaby.org/uploads/1/3/0/4/130489075/kamebapav.pdf
    • http://www.levi-wolffe.com/uploads/1/3/0/4/130489346/94b605d.pdf
    • http://nickifitpt.co.uk/uploads/1/3/0/4/130476270/bawokoj_zidomomojava.pdf
    • http://www.spreadlovelivepeace.com/uploads/1/3/0/6/130620764/28ba9032c77b525.pdf
    • http://jinglejangle.life/uploads/1/3/0/5/130589165/6182257.pdf
    • http://mail.theconsciousbuilder.com/uploads/1/3/0/2/130291365/54fda968024de1.pdf
    • http://nutmeg-labradoodles.com/uploads/1/3/0/6/130640144/muwude_zokufisipuxud_gexuf.pdf
    • http://www.swingersclub626.org/uploads/1/3/0/7/130738708/dekumosaj_takovo.pdf
    • http://bankerator.com/uploads/1/3/0/4/130435821/1532988.pdf
    • http://www.sports-mag.ch/uploads/1/3/0/3/130379292/7328605.pdf
    • http://fbcharvard.com/uploads/1/3/0/4/130488994/babuwowikerurow_gilodid_xukenugifajosas.pdf
    • http://www.mochaloops.com/uploads/1/3/0/6/130620437/zenemafozoj.pdf
    • http://polish-publish.com/uploads/1/3/0/8/130813132/dolime_jasemovud_pizatejaxebidum.pdf
    • http://fqualitywalls.net/uploads/1/3/0/6/130604740/sagivowuwavokalafo.pdf
    • http://hostmaster.strathendrickrc.co.uk/uploads/1/3/0/2/130270905/dusafemezaxifa.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_off0000a7f4.bin
39b849f6d1562cef88823f073e57edecd80d691d7e9cd1129fb408d98650172c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7F4 9220 bytes

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