Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9935c7bd1b47ef…

MALICIOUS

PDF

86.0 KB Created: 2021-03-19 18:35:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 35da7aefe11fc8ed2af14d9740908288 SHA-1: 2b3a5e821298b3c4f3600560ee23de5a6a1924a6 SHA-256: ac9935c7bd1b47ef030cfae662c492ce8c92d37320626c60b09df738e2270e94
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs, with a notable one pointing to 'zajinet.ru/award', suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying the document as a link farm on disposable hosting, likely for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/award?keyword=the+old+man+and+the+sea+pdf+full+book PDF link annotation
    • http://pexukakadom.22web.org/does_samsung_galaxy_tab_4_have_a_microphone.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/huGBYA7/imagine_learning_student_login_espanol.pdfIn PDF document text
    • http://yewes.space/14270619091olg6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_602d3e1038fd9.pdfIn PDF document text
    • https://cdn.sqhk.co/zolokike/Oynghgd/copied_city_piano_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/pojizurigos/hfFIhgY/jemesazezukunoviwavibel.pdfIn PDF document text
    • http://bred-enligne.com/segekebopokowsl31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_604e160f52c29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_60158fc19fd16.pdfIn PDF document text
    • http://kdghy.online/594435497426p1yt.pdfIn PDF document text
    • http://fortuneo.biz/differential_equations_by_polking_boggess_and_arnold_2nd_editionltkre.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/2hbGrjg/stickers_virales_para_whatsapp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gebopotaxe.rf.gd/tigibopivop.pdfIn PDF document text
    • http://fokamosidiwu.rf.gd/97970567513.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_5caa830d609340848c1887ff5d4a533a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e05440e-7bf5-4690-9633-fc265fd4adb3/weseva.pdfIn PDF document text
    • http://dukizovisepo.rf.gd/97574714893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c66be914-4c4c-4b2a-8f10-d0667ebeda19/dijiwakunefa.pdfIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_bc59729f0901452d85b6f0001cb1a93c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 5172 bytes
SHA-256: 656f192f84f133fed38e77bc56ab9e8ded2a0e06a28d32abf1478a8c79024979
font_01_sfnt_off00011492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11492 12816 bytes
SHA-256: 14ab5df11507c8bbb2747b996779d2b95ccd12d613f6b5ecba72217b36f35ded
font_02_sfnt_off00013ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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