Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8e71f104ec895a…

MALICIOUS

PDF

40.9 KB Created: 2020-06-22 19:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38d844223545623fa637b220067c734e SHA-1: 59074a0d6199cf3668e1f3e383d05d0d57f92064 SHA-256: df8e71f104ec895a9cecf9cabc19ff36aa521fb8513f62f4750d76bc4b393b95
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs on similarly structured domains. This pattern is indicative of a link farm or SEO poisoning attack, designed to drive traffic to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://alexbrightphotography.com/uploads/1/3/0/5/130540583/130540583.html#pesos+volumetricos+de+materiales+de+construccion+pdf
    • http://balloonworxx.com/uploads/1/3/0/6/130605258/domitosifuvokotibex.pdf
    • http://wondertraveltours.xsideas.com/uploads/1/3/0/8/130874120/3822158.pdf
    • http://quantpioneers.net/uploads/1/3/0/3/130379412/gifomifa_monixe.pdf
    • http://books-ford-f150-karlee.com/uploads/1/3/0/6/130621084/8468376.pdf
    • http://krattliministries.org/uploads/1/3/0/6/130604808/butupagomanovisurin.pdf
    • http://youractguy.net/uploads/1/3/0/9/130969555/c0ccb.pdf
    • http://jornations.com/uploads/1/3/0/9/130969243/adb0633df.pdf
    • http://vintageandvineswinnsboro.com/uploads/1/3/0/6/130604630/94d86.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fbc.bin
cf73b4a852b710ecd8b7e5def1a1ae404339abe7f8a192725d072af854c1a505		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBC 5244 bytes
font_01_sfnt_off0000717d.bin
4caba5dc6f48dcb978f062b9e6b1c3809551dd9f84b5e9533658e42b7d211a4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x717D 11208 bytes

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