Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f19fcaab70c26a…

MALICIOUS

PDF

42.8 KB Created: 2020-03-22 10:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1198b0cf3b1a7e69fcafb88841d10631 SHA-1: 8fbf421c1a0ac11916ee2fcfa0c82377bfd0fd6b SHA-256: 32f19fcaab70c26a277e22e0a31c5f60d01c6722b22cad1a01f62d4bd3ac039b
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to various domains, a technique commonly used for SEO poisoning or traffic redirection. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to direct users to potentially harmful content.

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://extravirgincoffee.com/uploads/1/3/0/8/130874161/130874161.html#japanese+learning+books+for+beginners
    • http://jetsettertravelinc.com/uploads/1/3/0/6/130639747/babunexunebejemaj.pdf
    • http://mta-sts.mx.iammonline.net/uploads/1/3/0/5/130539095/totudusari.pdf
    • http://www.tairuaholidaypark.com/uploads/1/3/0/7/130775845/478817.pdf
    • http://chanjaafricanboutique.biz/uploads/1/3/0/6/130620230/3434221.pdf
    • http://katharinebierceyoga.com/uploads/1/3/0/6/130639728/5944424.pdf
    • http://siamcapital.org/uploads/1/3/0/3/130379141/zonomemizerezem.pdf
    • http://rkplasticsurgery.com/uploads/1/3/0/6/130620981/datoti.pdf
    • http://namyangitaly.com/uploads/1/3/0/2/130287867/8766890.pdf
    • http://catchmeabroad.com/uploads/1/3/0/7/130775842/48c3cbd97656b.pdf
    • http://artisanmadegemstones.com/uploads/1/3/0/6/130604787/3680319.pdf
    • http://www.teknologidager.no/uploads/1/3/0/2/130287529/mododepaben-vuzumajiwaz.pdf
    • http://webdisk.penngrovesocialfiremen.org/uploads/1/3/0/6/130620758/5402381.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_off00007d1b.bin
764cb61756e5ed1ecbcc662b06fe125f4875e4254c26dca60ceaba8a0c9171e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D1B 8088 bytes

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