Malicious PDF — malware analysis report

Static analysis result for SHA-256 28aae0ca326b491e…

MALICIOUS

PDF

68.0 KB Created: 2021-03-13 20:38:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83e237b572f0c5d4c2d0d5abb9d97246 SHA-1: 7a43405995d5e92f79a598d3eb9830b2512fbf4b SHA-256: 28aae0ca326b491e73c1b5ce4c9e0ebb3801474f314091a0046d8daabf08f8fb
156 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 are to benign-looking PDFs, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://pelibifir.ru/wix?keyword=google+soccer+recruits+2020', is directly embedded and appears to be the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=google+soccer+recruits+2020
    • https://kuvitoguke.weebly.com/uploads/1/3/0/8/130813837/8206748.pdf
    • https://cdn-cms.f-static.net/uploads/4375698/normal_602c5afc22cc1.pdf
    • https://cdn-cms.f-static.net/uploads/4487187/normal_6040134f4532d.pdf
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/wonosepasitibodefato.pdf
    • https://cdn-cms.f-static.net/uploads/4482403/normal_601b31a6f2f33.pdf
    • https://cdn-cms.f-static.net/uploads/4476947/normal_5fda107a31f5b.pdf
    • https://cdn-cms.f-static.net/uploads/4454544/normal_6033e61ba6d86.pdf
    • https://cdn-cms.f-static.net/uploads/4373239/normal_604611cf0992c.pdf
    • https://sezivokup.weebly.com/uploads/1/3/5/3/135318733/sutexexe.pdf
    • https://remoruputudedux.weebly.com/uploads/1/3/4/0/134017090/kabazojuvawen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lurutopobi/who_are_the_clergy_at_canterbury_cathedral.pdf
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_a2b2d7f31b84484cbefea340dac1a40e.pdf?index=true
    • https://s3.amazonaws.com/wizitifowubux/menatofusozoxalamuseb.pdf
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_67844cb826e24f12a18e3e6b989b2ce7.pdf?index=true
    • https://s3.amazonaws.com/baxunaf/himno_nacional_mexicano_letra_completa_version_original.pdf
    • https://s3.amazonaws.com/putelekireza/1941307685.pdf
    • https://s3.amazonaws.com/fedure/bagamijakin.pdf
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_e2afaebdba224752a8f30c47d4b61fcc.pdf?index=true
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_1f238cdfe1cd4153b21a3a1883210e8e.pdf?index=true
    • 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_off0000ce2a.bin
35f6c88662c03b2f1b7544f025300a8d39d2f1e342fa79a014c1a8fc8a31570e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 5060 bytes
font_01_sfnt_off0000df7e.bin
c454aebe8b903b73dd0c8a20b082965eef950d5e3d54716638721a6859f824e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 10372 bytes

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