Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c7afcbb8b44d81…

MALICIOUS

PDF

56.8 KB Created: 2020-04-05 06:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 05b417a10ee199020cdcfdebb2e9d156 SHA-1: 83e263b90eecdcb0adec3544ee2803a7643a26c9 SHA-256: 65c7afcbb8b44d81a43b0884371c2e38d9c84ae59da1ce2da278545749b35ddd
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The document body, though partially obfuscated, contains URLs that appear to be lures for users to click on, potentially leading to malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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://my-localbusiness.com/uploads/1/3/1/4/131413040/131413040.html#nikon+view+nx2+tutorial+italiano
    • http://treetopyogallc.com/uploads/1/3/0/6/130621892/759641ba.pdf
    • http://diamondinsurancesvcs.com/uploads/1/3/0/5/130547069/vajuwi.pdf
    • http://kleaksgh.com/uploads/1/3/0/8/130874394/jonusejovelusitiker.pdf
    • http://boutaccessory.com/uploads/1/3/1/3/131398129/8468528.pdf
    • http://eventsbykellyandchandra.com/uploads/1/3/0/2/130288549/zedobuturixe.pdf
    • http://transformologywithhelen.com/uploads/1/3/0/5/130590297/27a8592ff9a02.pdf
    • http://waterdogpaddleboarding.com/uploads/1/3/1/0/131070656/8078824.pdf
    • http://escanabariver.com/uploads/1/3/0/4/130483741/lotozukozekuvipom.pdf
    • http://247-movers.com/uploads/1/3/0/6/130620471/04c131c9e74.pdf
    • http://montanacollegefairs.org/uploads/1/3/0/5/130590105/gidewetibe_demugusuzos.pdf
    • http://greenmountainacademy.org/uploads/1/3/0/6/130639114/9864440.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_off0000b31b.bin
abab66de89d1ffa4c361d49fb11fb2d7f484e6aecedb6c230a96a38e1c4a0fa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 9492 bytes

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