Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5cfe2da5e7c3f55…

MALICIOUS

PDF

80.1 KB Created: 2021-04-15 22:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2e3fc0c21d026a729077d15efb85437a SHA-1: 22289e036e3768931089956e0bc6b12ee2ae7604 SHA-256: c5cfe2da5e7c3f5518178466fcff795978721246d7ac22b7b5eb26df8c57f89e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it is part of a link farm or SEO spam operation. The primary URL, https://xezojetit.ru/strik, appears to be a redirection point for further malicious activity, possibly phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/strik?utm_term=how+much+does+a+maytag+repairman+cost PDF link annotation
    • http://remont-kvartir-otzyvy.moscow/niregbqaez.pdfIn PDF document text
    • https://gipewiraxo.weebly.com/uploads/1/3/5/3/135334151/meduterizizudagiwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_60322623a2aab.pdfIn PDF document text
    • http://naturalm.space/high_school_student_resume_for_college_templateq7mhs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_5fda5a5ae38c6.pdfIn PDF document text
    • http://deflecfcvy.best/please_be_guided_accordingly_in_spanish1htod.pdfIn PDF document text
    • http://smartcreditscore.info/nhac_thieu_nhi_ca_mua2tz90.pdfIn PDF document text
    • https://sujuxeneme.weebly.com/uploads/1/3/1/3/131380470/c718af016e0e2c2.pdfIn PDF document text
    • http://cardioactiveuficiale.site/xogupapukidogefivanavuvo1zs4z.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/selivuvumepaveb/harry_potter_and_the_half_blood_prince_chapter_6_summary.pdfIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_7e2b6322f26649baa9d926394b6080ed.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_f18686e830924162ac04e0c1a27e93c6.pdf?index=trueIn PDF document text
    • https://b81f28a7-a6cc-4df9-aebb-a76b708ee4b5.filesusr.com/ugd/df05b2_9b87a2823d7c40cb9adcc9053ab1f4bb.pdf?index=trueIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_f8ef8a31a3544d8080a6d387e658f386.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tumasun/linovufowales.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/global_competitiveness_report_2002.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/8020509085.pdfIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_4136506b6de64e028b86e05bc651e2f3.pdf?index=trueIn PDF document text
    • https://ecc4b077-82d2-4cf1-ad45-1e482560a890.filesusr.com/ugd/5d7ac5_0c15b02d2f1644b58ca995ea4a620a16.pdf?index=trueIn PDF document text
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_5854d35c0b114102b825b49b55112806.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_6a37dc8cc94d4f3ca84ef95d22d381e1.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_655b662a37ab46539b3fc403a497b686.pdf?index=trueIn 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_off0000fa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 5608 bytes
SHA-256: d441ef91928d50e74e7c6b74fe3fc226cd10405be51f5dfef41e0b1de4f22170
font_01_sfnt_off00010d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 10904 bytes
SHA-256: 2f28b098ff06d4dacfe14b0460527c1c329141894b89d6af14ae1d06e965098c