Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f76be1e1250ad4…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 10:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7b083ae6d97175d0e4d027bc5ec0f89e SHA-1: 9eb1d9c860a76f80c436cba4e899de0b4d882c87 SHA-256: 31f76be1e1250ad432b8ba725942a85c7c7326bd940a96d0296bfc1347a1f8c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to manipulate search engine results or distribute further content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://imhome-listings.com/userfiles/files/82749882624.pdf In PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/xiwezamekuruma.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/15518475966.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/2912099000.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/95895049060.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/zomekesenav.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/nagupebodijolamexu.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210912025343.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/77778504016.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/33257003665.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e0dc625826eebd068ab42783c83a7f1b/8818248870.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/80294166669.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/befeletabelafogopigajekiw.pdfIn PDF document text
    • http://confetti-seasons.ru/upload/files/wuwigokosujakuxobej.pdfIn PDF document text
    • https://drlanda.hu/user/file/68403631779.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/rapowunavusadaduj.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/woviv.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210920082130_15isxa.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/42285330526.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/xibujujevakegowolenesevor.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/96082624010.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161311a033de5d---38156164639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=samsung+s5+broken+screen+data+recoveryPDF 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_off0000b2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C6 11296 bytes
SHA-256: 8277ffaa849d106267596deb934212fe85a75ceaea69f7ea6de19e4ca53fb1a5
font_01_sfnt_off0000cd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD33 16260 bytes
SHA-256: fec522dc882fbfb42cca3efbee456b82dc67902edfd185f1ff2915e909b5ecb1
font_02_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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