Malicious PDF — malware analysis report

Static analysis result for SHA-256 970cf29af182cf63…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 22:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3d7b854e9a07674618dc812146ec1bf SHA-1: 063a74b85f3f67bcd0f2ce6650439cf37a3f446c SHA-256: 970cf29af182cf63f4fe9703de783e5fc929f76267b7eaac6424f0db8a61594d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=english+children%27s+books+free+download
    • https://llbyggodesign.se/UserFiles/files/14372264195.pdf
    • http://harryreichert.de/uploaded_pics/News/file/24854235098.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7f138daf---98737962043.pdf
    • http://aaronandanthony.com/userfiles/files/tegizibajapefanomimijobik.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16141c1cdeda48---madipavunibizinakoxix.pdf
    • http://beerskiboot.com/img/upload/file/44461286204.pdf
    • http://china-zub.ru/userfiles/file/11942797733.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/wavenavopopetagutasotukur.pdf
    • http://szjglaw.com/uploadfile/file/2021090109553573499.pdf
    • https://cottonweb.net/userfiles/file/7949441814.pdf
    • http://munnarteabungalows.com/userfiles/file/55141557456.pdf
    • https://producedepot.us/userfiles/files/40871295886.pdf
    • https://adepotcustom.com/UploadFiles/file/20210912000900110.pdf
    • https://yesilkoyluleriz.biz/resimler/files/safanidumupovozarijuvuwi.pdf
    • http://canadanur.com/resimler/files/84459093265.pdf
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/45167971094.pdf
    • https://implantsdentairesdesmoulins.com/upload/editor/file/xadowukupuvatedir.pdf
    • http://mirai-kankyo.com/userfiles/files/sonikevisibifigalopupenug.pdf
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/xanirapugixanadibogipo.pdf
    • http://sarica.com.tr/ckfinder/userfiles/files/65533309499.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/48861488907.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/lulavoja.pdf
    • https://geneolock.com/ckfinder/userfiles/files/71247220.pdf
    • http://adice-area.com/pictures/files/wozadanamadedokapiju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd6.bin
e396b43304828bdf068d804eef1c21f4c2c142d7d0c22be60cccd3527b68282c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 10992 bytes
font_01_sfnt_off0000f724.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 16792 bytes
font_02_sfnt_off00010f36.bin
4cb8a608067c7a5b92eec1df8461c055f27cb14fddc7b226bea2ad7bf5b24b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 17960 bytes

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