Malicious PDF — malware analysis report

Static analysis result for SHA-256 870ef169223e3642…

MALICIOUS

PDF

74.8 KB Created: 2021-03-03 06:38:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 050f8e6f0e167d94ba09cdfc488a0235 SHA-1: 1f4ef24e1807ef0f2a7ad98484966847ed37357f SHA-256: 870ef169223e36428f87071c20dacdd0d174ede5de261ecd056601e61f5c1cf3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary external URL observed is vilenefex.ru, which is likely part of a malicious link farm. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', indicating a phishing or trojan payload. No scripts were extracted, but the presence of numerous external links suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=aledo+middle+school+band PDF link annotation
    • https://gorogonib.weebly.com/uploads/1/3/0/7/130775466/felitusagika.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444646/normal_602b020d92b34.pdfIn PDF document text
    • https://tijesefufejeje.weebly.com/uploads/1/3/4/8/134858706/12efec6f768e.pdfIn PDF document text
    • http://my-favshopf.online/28787266552cw61v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421611/normal_5fc90120611c7.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/1266337.pdfIn PDF document text
    • http://reduslim-siteofficial.site/fiwofotamemij29r5d.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/1hgca6l/lomemomegib.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/ZjjiaaP/gamobuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawomo/hbtWpji/pitabipusade.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/wuvepilamamuse/child_protection_act_1999_mandatory_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/59434879629.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/protein_electrophoresis_methods_and_protocols.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/iron_jawed_angels_viewing_guide_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/kiwerebatuf.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/zofoxuregifodifefuj.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/65468516326.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/jaranuxun.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_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 5212 bytes
SHA-256: a996c0a5976d73e986a2c7854760481c27f80e381e3c4ff5f0ce050eb6c2a69b
font_01_sfnt_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 10388 bytes
SHA-256: 963225c9da309230ff22d80448bd3e5eb93f407284f9ebd3effec9ea4245cd1e

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