Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c30ad9d2d7f4f3…

MALICIOUS

PDF

41.4 KB Created: 2020-06-21 12:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: cedd246533358490a29cc374133f10c5 SHA-1: b431590fbe9b8d2c25e870419a483f92f33f52e8 SHA-256: d9c30ad9d2d7f4f3de7c4569776993eca645dfb9a45d7b14d00c77d7ffd9c17c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous suspicious URLs supports this assessment. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users or host further malicious 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://mail.cultivateyoga.com/uploads/1/3/0/6/130639534/130639534.html#pole+dancing+lessons+durham+nc PDF link annotation
    • http://autodiscover.pelilens.com/uploads/1/3/0/4/130488694/gabujij-nurod.pdfIn PDF document text
    • http://fieldnotes.it/uploads/1/3/0/8/130874298/tafoxajof.pdfIn PDF document text
    • http://fashionandjesuspassion.com/uploads/1/3/1/4/131407797/medobubizerito.pdfIn PDF document text
    • http://mahi.org.nz/uploads/1/3/1/4/131437364/ec587c0b.pdfIn PDF document text
    • http://theinvisiblemomma.com/uploads/1/3/0/9/130968988/ziluremazuzeralugud.pdfIn PDF document text
    • http://staceyanderic.us/uploads/1/3/0/5/130550752/porobijin.pdfIn PDF document text
    • http://mta-sts.mail.acmechassisfactory.com/uploads/1/3/0/5/130551607/degozafali_mugavu_jigiperaf.pdfIn PDF document text
    • http://jgmedia.blue/uploads/1/3/0/4/130476180/mexodal-pupeve-bozikupuxepomos.pdfIn PDF document text
    • http://immobiliere-mastronicola-olivier.com/uploads/1/3/0/6/130640006/zufuzizopel_todakal_tavaviwazulix_netijewo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6539 5156 bytes
SHA-256: a3c93783ead02581a2430c0a13dd1bcffced20b2581a6dff05440d42875fdb42
font_01_sfnt_off0000767e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x767E 10508 bytes
SHA-256: b99249563bb823a4d524707f1319ccbec41ae8737837ebed0c28bfa376a351bd