Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2b89d7f31ad1a6…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 20:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5aaa44ea03b760f2f7c3e4a80193e2e SHA-1: aef9adc80b1541187f32a45bd5c61b9f89fe713c SHA-256: 1e2b89d7f31ad1a6c2e2f4b42e1f930fcf7f097e795d144a0cb7eda589078329
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=iriset+signal+notes+pdf PDF link annotation
    • http://kooijobs.in/ckfinder/userfiles/files/tabin.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///43128845193.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/fukoweboriludamojiwet.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109071404429770.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/sumexetegotamabit.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ddcb3dfb---zaran.pdfIn PDF document text
    • https://chv.vn/userfiles/file/48201884321.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/97784576686.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/24218221625.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/mutipuxukigosiwarajiwo.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/96744533808.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/45923747180.pdfIn PDF document text
    • https://avflash.nl/upload/files/feribusipokusexevumod.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/8601306426.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/fuliroxonasojatokeku.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/gofoxojabatodopojoluludi.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/pifagin.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/dinima.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///lupebamekakaxiwokuz.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/badekewarib.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/kolopolelasitobebaw.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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 10624 bytes
SHA-256: ceb5b24af01c40895f3d5fd4ca84fc3638ac47a23d90f6314dacc56fbf573877
font_02_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 18648 bytes
SHA-256: 6fa4b8f5f6626c20e66f5d8cc29cbe38a225dbe1aac23d13bb73a2609d80c856

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