Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ada6e1c5d85a31…

MALICIOUS

PDF

70.3 KB Created: 2021-09-10 13:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b31de575d1edd7366c57c40bf1e04af8 SHA-1: 79a297d29ee311e485d6ca04e3b1199e6138ccce SHA-256: d6ada6e1c5d85a312ceeebc4e66c4d1536ad5560e80a61470c46ee240d6febf4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism for phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link farms. No scripts were extracted, but the structure suggests it acts as a loader for other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lifeisartfoundation.org/sites/default/files/images/userfiles/file/pavuzukikufemesuro.pdf In PDF document text
    • http://abwingsva.com/uploads/files/9347936374.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/24690055708.pdfIn PDF document text
    • http://idroter.org/userfiles/files/7317699896.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/43733492712.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/fosesupinudu.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/23711993897.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2750702629.pdfIn PDF document text
    • http://askaudit.ru/price/sadivifa.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/91571717755.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/42012762617.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/sokedifutuzavuxorap.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/kugipumosiladutoxibigejel.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/poginidetiwanosamejujaje.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/72021231709.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136485e80097---34381563140.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/midasasefirivoxarusigeb.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613879434ef17---funifigiwisimigax.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/44952689246.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/46278829196.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/rowidixizakunudawej.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/81628579944.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zupasepopavomog.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/65876676430.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/dipokarevijogukezizerer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=vio+horoscope+play+storePDF 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_off0000b55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6C 15076 bytes
SHA-256: 8f2938c12edff40552d935053f2cd054b22402d015813ca302ac256459a0aff5
font_02_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 10448 bytes
SHA-256: ad86c8afc0d38f74d5fb11f29a6efe06f746aab2188692b02dce859f2c5ef484