Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d4b524b042764f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-14 22:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc316f755289bb4e34c32e3a13a0c025 SHA-1: 1fd0a6f2f8fa32016fb930f04f2b5d2c62ba3955 SHA-256: a9d4b524b042764fe818a08b94b909e879ccc5c4d1ccaac502b64bdec276e62f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified external URIs and a callback lure, suggesting a phishing or scam attempt. The presence of numerous URLs, many using common patterns for hosting malicious files, further supports this. While no scripts were explicitly extracted, the PDF structure and associated heuristics point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=car+parking+multiplayer+money+hack+ios PDF link annotation
    • http://cross-winds.in/upload/contents/images/images/17047215988.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/6923491573.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/xavuraka.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/87687931573.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/kekopo.pdfIn PDF document text
    • http://355353.ru/userfiles/file/vusijamedigotepoputob.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/97573672519.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/ganorijabuk.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/suvaxet.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/27798602401.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/46227058405.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b78b16a27f---relatemobomiwakevuxin.pdfIn PDF document text
    • https://proxus.nl/file/poluru.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/nosezus.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/40004943260.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/debagapuziziginebewes.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/27592334278.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/jaxewovenomozarizirisa.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/vativet.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/629464215.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/35335555845.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_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 11160 bytes
SHA-256: aa92c0f369ab658b8b2eded61287e1556759bc61af8b2be17efc3d39dbf1de90
font_01_sfnt_off0000fcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 18028 bytes
SHA-256: 11d3b8493d98ae3fb1befd670680a1271959242a5a297f96e3c6795914f627f4
font_02_sfnt_off00012b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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