Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b34af8721007eb…

MALICIOUS

PDF

87.3 KB Created: 2020-11-13 06:27:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1840ff0793bff0efb38f9370c2e0bcd0 SHA-1: b8a7f615d96d8c9f1b05c66dfc52b7f074a24800 SHA-256: b2b34af8721007ebc5511a0febb6353548c72695b415b19563583b6e258f187f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a common tactic for SEO link farms and potentially malicious redirection. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to potentially harmful content, possibly for phishing or malware distribution.

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 https://traffking.ru/123?utm_term=looking+for+alaska+characters+description PDF link annotation
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/xoxedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415068/normal_5f9b3b3320308.pdfIn PDF document text
    • https://kipuxemoxux.weebly.com/uploads/1/3/4/6/134616309/gelemikumalomelojobe.pdfIn PDF document text
    • https://bivamotitujodo.weebly.com/uploads/1/3/4/7/134712473/2904938.pdfIn PDF document text
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/4e0663a59.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/2127764.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dobesogum/47277726836.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/kizetiseb.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/begum_rokeya_biography_in_bangla.pdfIn PDF document text
    • https://s3.amazonaws.com/pamavon/air_transport_act.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/bending_moment_diagram_and_shear_force_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/unified_remote_modded_apk.pdfIn 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_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 5420 bytes
SHA-256: 280e3c1ff22f2112a326a453dba6a004585f76247c7f0fbd73f500a7486e8fcd
font_01_sfnt_off00012a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A33 11404 bytes
SHA-256: 3b564ba40b030664325b38cc93374f5000b4bea64c5d22d99eb6438c45a6ad9d