Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c89ad1ef7e673d6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 03:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 746b243752aff92db9219311d6f4e6de SHA-1: 48c0f9684349efecd09303c88149aa056efc5d5b SHA-256: 8c89ad1ef7e673d63f264f074006f67b9677348fab72814f9eeeb50f6cda5b59
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the overall structure points to a malicious document designed to trick users into clicking links.

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 http://fatamorgana.fr/uploads/assets/file/43702160378.pdf In PDF document text
    • http://haphadoor.com/upload/files/movisukebemewa.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/pekirefujojaxavewizikotod.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/11464740668.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/12344390513.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/xoferosafe.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/64195394970.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/21970673283.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/95333916770.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/27467015945.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/75c0ad6c0c3bf477f726bbba015db314/77475981787.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/78393321107.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/39262089381.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4842ea58---pawofepupumutepopuwakaba.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/31855610249.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xawutovepadoluvegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+your+android+phone+charge+fasterPDF 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_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 11404 bytes
SHA-256: 8a40631635a8c14bff1662b09eff1380d775bc678874883e838a0a431fe5c3ea
font_02_sfnt_off000110c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 17620 bytes
SHA-256: d9a202a995760da46fb27c2dfad8c20b433b5a80281eacf2cbf74f119a473567

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