Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd66ca5ee094ef1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 14:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad3075669b53d652cb0bb31ca8e9e6d2 SHA-1: b7ec5cf88310e9a6147d46fd2d33be532da99652 SHA-256: 1cd66ca5ee094ef1b123c91160e9d50c69da98bdfdd46ab78d92dad24d34ba6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected 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. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on disposable domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hfnhsw.com/upload/files/tavedipewedale.pdf In PDF document text
    • http://tykhchem.com/upload/files/xokazatowuvukakobelo.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/42528291051.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/wetunebijufibewizow.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b61d385b57---20914805405.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/xexubelesesijafuvixen.pdfIn PDF document text
    • http://dfanchem.com/upload/files/40222677656.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bce3cf2dab259f6180168b7d4ee0e36b/2779761601.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/robotabatetenuxog.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/36836879407.pdfIn PDF document text
    • http://fgosvo.ru/files/files/nivatazob.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/73714992135.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/fukipikeno.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/46000181332.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/tevimuvozezorivapewiwuju.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/51926198857.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/gokarifak.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/kamimesujaxagim.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/31242748480.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/rusewun.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/zevotuxemosusopulukuzid.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/pupumogamugabebosifij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=live+football+streaming+apkPDF 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_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 10956 bytes
SHA-256: 6ee70c35911c6d07590e4f3d72dda30cfc696ad072350e36691a28b04d069449
font_02_sfnt_off00010f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 17476 bytes
SHA-256: 3a9084bb26fbb768249cb78871c3e10e092f9e5e0bce4592df60ae021e4c647a

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