Malicious PDF — malware analysis report

Static analysis result for SHA-256 0761a4147406969b…

MALICIOUS

PDF

46.9 KB Created: 2020-11-05 23:01:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec742438ebd153bc5ff736ff916fbc98 SHA-1: 55af8516e7a8af04da8f60a744bf980119572923 SHA-256: 0761a4147406969b7b1a3a3bcd7ca883f713307bdaaba8cda2e74aa43123748d
96 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating an attempt to manipulate search engine results or direct users to external sites. The document body, though heavily obfuscated, contains a URL that appears to be part of this scheme. The ML classifier strongly suggests malicious intent, likely related to SEO spam or phishing.

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 https://traffset.ru/123?keyword=christmas+terms+list
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/1660a45b3e6d.pdf
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/559f3.pdf
    • https://sajenaviwabawi.weebly.com/uploads/1/3/4/2/134266368/mobijub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rijedifatufod/lugasofijerepaneduxo.pdf
    • https://uploads.strikinglycdn.com/files/bd326bdb-20cd-48ee-9139-62cd790082c6/90719250670.pdf
    • https://uploads.strikinglycdn.com/files/ffcdcf41-0e4b-4776-80c7-db4d92e35f85/11593704986.pdf
    • https://uploads.strikinglycdn.com/files/f4f6c866-20ea-4f49-b2e6-a953b75db26d/fab_laundry_detergent_powder.pdf
    • https://uploads.strikinglycdn.com/files/56912cf1-b673-41d9-a978-697ced7c1c7b/being_a_man_paul_theroux_questions.pdf
    • https://s3.amazonaws.com/bokelur/84379840556.pdf
    • https://s3.amazonaws.com/fejenijovekozu/jealousy_is_a_disease_quotes.pdf
    • https://uploads.strikinglycdn.com/files/df5346ea-29d4-444a-9f31-56e64236bf51/36991181658.pdf
    • https://s3.amazonaws.com/vavale/93694970836.pdf
    • https://s3.amazonaws.com/dorulusof/12028771732.pdf
    • https://s3.amazonaws.com/muvojugejoxip/barron_s_ielts_superpack_2018.pdf
    • https://uploads.strikinglycdn.com/files/b5e27741-f3ce-4b5f-9b08-bcb549398e41/69455959609.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a35.bin
f2e15d372e73ff82cb3989793f079d42b50e14ddb39e2ceee832d040aa0968fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A35 4828 bytes
font_01_sfnt_off00008a60.bin
73c05b6a5ff7b01883f1ff2a6481ac826cf881fc18e9319dbb36a88f166910a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A60 10732 bytes