Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea1c6cd54bd6eaa…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 11:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1651b55b93616454b5b16510292de78 SHA-1: 201ca60c26305fd0b7045933a9aad5434ab83d3d SHA-256: dea1c6cd54bd6eaa1ad2dc0653067abb9edc9ac225ea5d2468b7e3b83a84060d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one that appears to be a redirector with UTM parameters, suggests a phishing or scam campaign. The heuristic 'SE_CALLBACK_LURE' further supports this by indicating the document may be designed to trick users into calling a fraudulent number, consistent with tech-support scams or billing fraud lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pistant.ru/uplcv?utm_term=demon+slayer+digital+release PDF link annotation
    • http://windowsplusllc.com/ckfinder/userfiles/files/1521600625.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/rojosukipemelobanexalo.pdfIn PDF document text
    • https://vzglavniki.net/data/file/buzunekiraluwufej.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/jelejixaposuvowotazad.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/bawunupezenekazuk.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/mawoso.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/xamojakifeloxelutatapukez.pdfIn PDF document text
    • https://nexapos.com/upload/files/jatuxawejabixo.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/jofesugidepivuwogusir.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/xezizudaruxovujub.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/94257807856.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/46361210189.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/86072330918.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/4470765683.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/12217762101.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/85833867690.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/87ddce43366e80566c067bd3d5bcdc47/97099743641.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412ac5db787---talepi.pdfIn PDF document text
    • 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_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 10708 bytes
SHA-256: 08609d28b01b7b3ec12ced7fc5b19b2d8a05ebe640ff3af742432967922b7e4b
font_02_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 22568 bytes
SHA-256: fdce75aef572f10a8460202093dc7dd090c09fc0680f70e2512a0e2d2cf4a37c

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