Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9c3883ae549ba6…

MALICIOUS

PDF

42.9 KB Created: 2020-03-12 06:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9c39537ae5a60fef77cb6b91f158ed1c SHA-1: eba81d6832b83b738d6d8d368008631718d48890 SHA-256: 6a9c3883ae549ba601619cf43225a8c3566912523b3f0f6b306d1e74c3bbdd9e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO poisoning tactic. The embedded content, though obfuscated, contains URLs that are likely part of this scheme. The ML classifier strongly flagged this PDF as malicious, supporting the interpretation of a malicious link 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://65bancker.com/uploads/1/3/0/7/130738593/130738593.html#ace+questionnaire+updated
    • http://psychologue-psychotherapeute-waterloo.be/uploads/1/3/0/2/130288326/tujexofotuxewapu.pdf
    • http://veldinsurancegroup.com/uploads/1/3/0/5/130539130/3424725.pdf
    • http://pineapplebarbershop.com/uploads/1/3/0/9/130968925/wepap.pdf
    • http://photosbypro.com/uploads/1/3/0/3/130379503/jadosodula.pdf
    • http://cobramsc.com/uploads/1/3/0/6/130639656/ziwojufikez.pdf
    • http://www.mercystreetchurch.com/uploads/1/3/0/5/130588769/486010.pdf
    • http://milongacambalache.com/uploads/1/3/0/2/130287866/b81270.pdf
    • http://bearsversusbabies.org/uploads/1/3/0/7/130739088/7144707.pdf
    • http://boneandstone.com.au/uploads/1/3/0/3/130379158/7bbbd694ded93b.pdf
    • http://annachristinephotography.com/uploads/1/3/0/7/130738909/rijepot_vezagakujemit_tifekegagosiki_ripotunidotede.pdf
    • http://superior-carehome.com/uploads/1/3/0/5/130590257/buxad.pdf
    • http://adventuratraining.org/uploads/1/3/0/5/130588559/0331a40e6.pdf
    • http://www.txsmartlandscape.com/uploads/1/3/0/5/130588568/luxajupigeji_dikije_tozilaxi_maxez.pdf
    • http://fieldsofjoyfruits.com/uploads/1/3/0/6/130620650/7783026.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_off00007e51.bin
eaca032b71ce26f60ee825dea0d57d730ff351881973e6c5d32f5ad7ee3538b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E51 8424 bytes

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