Malicious PDF — malware analysis report

Static analysis result for SHA-256 da04fb95aa0d824a…

MALICIOUS

PDF

90.9 KB Created: 2021-09-16 16:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 477466e47ae8924da4744f4c60cd5fd7 SHA-1: 27e41941c6ddfccac8966f975175ae3b164d909c SHA-256: da04fb95aa0d824af1e31563b5f236d793647afb204342eda90ada0d0a2f4ae9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=1979+revolution+black+friday+android PDF link annotation
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/dca2d5bdc8c4a696f34f7e7b488ea8ef/gazekuwoju.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/33701071031.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/paduxefemugejor.pdfIn PDF document text
    • https://kiptep.ru/file/dolexanew.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109130458515562.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/jizijidib.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/6673302174.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/59474648198.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109071049237795.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090822085573499.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/93304217050.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/favubuj.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/xovomibubumuxalimogodozal.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/60687748081.pdfIn PDF document text
    • http://isgsrl.it/images/file/sixov.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/67229968811.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/55891210797.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/27501906418.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/didatixo.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/99723465692.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/10410944934.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/73240856768.pdfIn PDF document text
    • https://greenways.at/userfiles/file/25497954759.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/niruko.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 10984 bytes
SHA-256: 25b5c39d01d24f798441bf735ce18ccbf2d58159450d6f860eaaef6cdb4fa096
font_01_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 16840 bytes
SHA-256: 637f282a09958e0217b626fc4698b4d72005eb4dad7007e6f209d5e5c10a4ef2
font_02_sfnt_off000115d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 18136 bytes
SHA-256: a7ea66f610210b2956fe30e39adea3c9946fb97c633fde6f2418c5fbb298987a
font_03_sfnt_off00014540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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