Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff61677b41f44ffa…

MALICIOUS

PDF

77.9 KB Created: 2021-10-07 08:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8e4a9896fc1ef9bc066cc511ebb20e2c SHA-1: 8126a176cf54c750797df028e79865b5843975e6 SHA-256: ff61677b41f44ffa91cc7ff44317aabceada49f9514734284334469264991bf6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to disguise malicious links or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://butagallery.com/userfiles/files/morigazorujavilululuf.pdf In PDF document text
    • https://etcbt.com/userfiles/file/punubu.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210921065027.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/joleniluvevezi.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/74555981271.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/vizelunodumogupegamipiwu.pdfIn PDF document text
    • https://wecareprogram.org/images/file/51330411293.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/59095180773.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/27786911636.pdfIn PDF document text
    • https://granitnet.hu/editor_up/85980248652.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/21890784904.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/45527906352.pdfIn PDF document text
    • http://hbaoge.com/upload/files/zasanurojin.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/mopileraxajapukur.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/polijun.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/18575910372.pdfIn PDF document text
    • http://elsped.hu/files/file/mifoka.pdfIn PDF document text
    • https://matratva.in/userfiles/file/lufigezuwiruru.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/85425848631.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/lurisivakelupujo.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/14997076220.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/76935687176.pdfIn PDF document text
    • https://patc.fr/imagesfile/tabezodafara.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/kerazoked.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=minty+pickaxe+code+2020PDF 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_off0000cb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2C 10736 bytes
SHA-256: fa4a06c184a92121e107552bbc6e8ca1ab6420c81c55c6a1b534c4db0338cd38
font_01_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 17632 bytes
SHA-256: 0b5d0df5fad1a3a96a391e851e3cf38931de0b7d88aba2c54951fa262db1b461
font_02_sfnt_off00011213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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