Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4095ab39693e5ae…

MALICIOUS

PDF

75.1 KB Created: 2021-04-05 00:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13c61ee51b6f068e3d9453ff6d285965 SHA-1: 81d44828300805e9eb4c577d597a01dcdc77cf7a SHA-256: f4095ab39693e5aea2a4f7a18236757b008b1f76a61fdd91e8d6006de1a8cdcd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=can+bus+troubleshooting+pdf
    • https://cdn-cms.f-static.net/uploads/4425727/normal_60628ab09124b.pdf
    • https://static.s123-cdn-static.com/uploads/4464530/normal_6009433386e1c.pdf
    • https://pijefezumiw.weebly.com/uploads/1/3/1/3/131379255/9059d5a.pdf
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/9335709.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kesewoge.rf.gd/vakatuzovirulomeze.pdf
    • http://zavodopivuzaraf.epizy.com/gakakudegilumojokeseni.pdf
    • https://s3.amazonaws.com/zaxuledo/birthday_wishes_for_free.pdf
    • http://redexini.epizy.com/xufirapatevob.pdf
    • https://s3.amazonaws.com/wujafivabipo/best_corporate_identity_examples.pdf
    • http://vokerajud.epizy.com/14868208212.pdf
    • https://s3.amazonaws.com/wifukedot/xoxirosa.pdf
    • https://s3.amazonaws.com/ladojenefe/13705274100.pdf
    • https://s3.amazonaws.com/luborinizu/gefuberamazuxowole.pdf
    • http://bofujobovunuj.epizy.com/castrol_10w40_gtx.pdf
    • http://lodufuvu.epizy.com/72925939112.pdf
    • https://s3.amazonaws.com/sesafefanulokam/bapofazenuboxebopav.pdf
    • https://s3.amazonaws.com/bofake/laxufeteguvugufozezaso.pdf
    • https://s3.amazonaws.com/mikibetiv/job_application_letter_with_resume.pdf
    • http://bidavotajowev.epizy.com/acupuncture_in_neurological_conditions.pdf
    • http://valogaberel.rf.gd/31995038322.pdf
    • https://s3.amazonaws.com/novifamigot/12887747192.pdf
    • http://nowesiredud.epizy.com/functional_requirements_template_xls.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_off0000eaf1.bin
35cb041435aa523b497eb42015a6b05fed164f7d0b5eda6cd949f32be0b5b1af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 5348 bytes
font_01_sfnt_off0000fd0a.bin
24c6f907e9bab5bbb568dd20e9e768360f337970b69fe702d248f998fe7eaa4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 10020 bytes

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