Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf6b7c50c2adc95…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 05:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4350132f50afaf4a41ae1688a948fc91 SHA-1: 423a0cba351ffc2964577aa75afea691803ec7a9 SHA-256: 3cf6b7c50c2adc9548c1c9c74f0b72f2cb4c8b98035f6be8af3b5e536467698b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL distribution point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fatename.com/uploads/files/202109170801505366.pdf In PDF document text
    • https://pokereshop.cz/data/file/60780217298.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/81750442048.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/milup.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210901075705_904477154.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210914061207.pdfIn PDF document text
    • http://infunplastic.com/d/files/xopupopoxefotirirazorepa.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/bubuju.pdfIn PDF document text
    • https://digireg.lu/upload/jojamafutaxarudobidabuvap.pdfIn PDF document text
    • http://thuannam.com/image/files/67965071127.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/3992018051.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/vexowi.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/25458356004.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/95693656452.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e69451c71---65828665037.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/tikopojufoz.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/woxivibo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/11593290567.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/dilipurexukusafuvo.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/53469153350.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/64548135351.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/82277400609.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/28205316235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=malayalam+ttf+fonts+for+androidPDF 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_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 10488 bytes
SHA-256: 25d162cf2b6c2d617dc96137144a31400d1be6cd239d660effebf72d3707a63e
font_02_sfnt_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 17536 bytes
SHA-256: 99c412dde30e6a997cf5555d7bbb7b9ca060cb1e7ae1e1a20e45c723568ea275

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