Malicious PDF — malware analysis report

Static analysis result for SHA-256 c694b4d8e211525e…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 21:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 80f6850a0ca65e15fce7e73fead3a62b SHA-1: 9b74c0b1fd9a84fe4c3d3ee807c4717bc95925a9 SHA-256: c694b4d8e211525e6a8d0576ad43d7467ae47818b9f57e99400be934fcbc1aeb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm or distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a potential attempt to manipulate search engine results or distribute further malware. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://opusincertum.it/userfiles/files/79907746831.pdf In PDF document text
    • https://mwasafat.com/uploads/files/1474290636.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/85286786445.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/sagesamap.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///45541036312.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/99419338040.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145101b312ce---91142319484.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/73220905244.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/venupoxuxunufilidofulem.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/51873452047.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/tagamavapelukezosapesun.pdfIn PDF document text
    • http://acril.ru/ufiles/files/17175652135.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/gamufudawakarolizixotite.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/83401412658.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/33173899028.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/45966836397.pdfIn PDF document text
    • http://technocom.pl/editor/file/sukunebobovinojolol.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/41553474045.pdfIn PDF document text
    • http://test-immo.com/file/zurejapebifovukuwozuris.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e7d58317---legivelupigadidomaluz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=testing+apk+onlinePDF link annotation
    • 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_off0000cedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 17100 bytes
SHA-256: a097cbbd2d540c8c46c4dce44bd6aa7c3b17a407026967ec6fadcdba86b40e2e
font_02_sfnt_off00011363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11363 10384 bytes
SHA-256: e5315a42f0bc8e8bf52455c9fd5cedfebe402da7de470d5c96279f134861fa07

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