Malicious PDF — malware analysis report

Static analysis result for SHA-256 5295657e317d9388…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 15:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: da01d101d0a3d0439e77c25c6144e543 SHA-1: c7d09ed50914be972ed5cec96f26b0e52a3478a4 SHA-256: 5295657e317d93886978e7bce179111e87f4be843a007ec326bce542f1d5a426
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, suggesting a large-scale effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=xiaomi+redmi+note+10+pubg PDF link annotation
    • http://maynenkhiinverter.com/media/ftp/file/82177277798.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-6/20210906151527478331.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/xifokenimewafeji.pdfIn PDF document text
    • https://medtek.vn/storage/file/jeloxozadepazeri.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/siresuxubepivigos.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/maxepusejirafezifobejemev.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/teged.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021091403284873499.pdfIn PDF document text
    • http://iccarrentals.com/files/file/sagabekunufulo.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/kifenitiz.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/89204240714.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/37087351943.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/97929461707.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/81259548744.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/53145710307.pdfIn PDF document text
    • http://didopack.com/files/21963573348.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/sazezedikaveje.pdfIn PDF document text
    • https://parkettworld.com/upload/files/ladegekavajikemaximilew.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/jiwobilibalexad.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/55805897098.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090600091973499.pdfIn PDF document text
    • http://www.moyekolodin.com/files/sepibafokur.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/kemaludibajajapu.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/lodaromajarubiwaguz.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA2 10944 bytes
SHA-256: e2e998537038e4b6f0c80d961fba559e8df4ee4931dcc0280f1a5c2c09e1ca13
font_01_sfnt_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 17680 bytes
SHA-256: ccefc3afba5cf6f48bfcd6c55310ca2df735c174f5db532f5f11e043ba7c1c0d
font_02_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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