Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4525d60e60aad4a…

MALICIOUS

PDF

71.5 KB Created: 2021-10-01 04:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1b43c8ec2bc6ac412f8ae84316f4de1 SHA-1: 8137ccfb46e21b3234ce015c7232f92d4787b9c3 SHA-256: f4525d60e60aad4a9fc654d27e0aa21211a077368d012e60f37a1201e8d09d6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on various domains, many of which appear suspicious or disposable. While no scripts were directly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://propactionvehiclesuk.tv/userfiles/files/teluladifotudagojewanume.pdf
    • http://jingkangchem.com/upload/files/puvubilogizoruxagugepigi.pdf
    • https://southafricapools.com/contents/files/28551159045.pdf
    • https://landbondcorten.com/attachment/file/2becda44bc78b4a285a9cf630841e363.pdf
    • http://ltptech.vn/uploads/userfiles/file/55040255066.pdf
    • http://www.bluefashion.cz/ckfinder/userfiles/files/64441309758.pdf
    • http://stromzeleny.cz/file/45176131237.pdf
    • http://miminku4.com/contents/files/pegofefuwugeturijatinap.pdf
    • https://easternresources.net/ckfinder/userfiles/files/24439112046.pdf
    • http://3t-t.com/User_File/UpFile/file/20210920033406_bWFuZXNvdg==.pdf
    • http://zhongjiukeji.com/upload_fck/file/2021-9-30/20210930200508739364.pdf
    • http://dealershop.es/camarasegovia/userfiles/file/pagutozajosekale.pdf
    • https://samoinstitute.mn/uploads/assets/file/sunotunebawis.pdf
    • http://seatraderhk.com/userfiles/lafazedenuxotixudawetewu.pdf
    • http://toitureetfacade.fr/data/Files/96603300003.pdf
    • http://www.urbanwaterways.info/files/binivulawafirafidulivevi.pdf
    • http://lamorenj.com/userfiles/files/85865586140.pdf
    • https://schodyperfekt.pl/user_upload/file/wozulaf.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/tesekagabela.pdf
    • https://siroyensao.com/upload/files/mozanasaxu.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/17796793526.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=deep+rules+for+focused+success+in+a+distracted+world+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b33f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB33F 16792 bytes
font_01_sfnt_off0000cb56.bin
9a6861e28f172bfd14e140dee79e5474061e4dff26c90c443dd000cf075b301d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB56 10800 bytes
font_02_sfnt_off0000e464.bin
c01cc7280354af0ad2e93de365ede2cb29196c2c72c1c958a54aa26ac20073df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 17108 bytes

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