Malicious PDF — malware analysis report

Static analysis result for SHA-256 8524b2255e9437a5…

MALICIOUS

PDF

71.3 KB Created: 2021-10-08 09:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a7f0660010f62e6f21b0ef92e9a8c4ea SHA-1: 7185d21562cb1052c07129a6ef16142245a92637 SHA-256: 8524b2255e9437a539c90d751ffa76c0e51e7978e217f10192dc7462a5b8d4d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URIs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, aiming to redirect users through a network of disposable hosts. While no scripts were directly extracted, the nature of the PDF and its numerous embedded URLs suggest it is designed to lead users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://majubesar.info/contents/files/91655720882.pdf In PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/99780721612.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/jiletobunevetasopijaduw.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/nanow.pdfIn PDF document text
    • http://indexone.ru/upload/file/19696470042.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/wikosavewolawefez.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/99043161062.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/64844728719.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/niwuxekexuboxuso.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/93846813516.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/xiziwut.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/2503338051.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/86186513706.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/72390246096.pdfIn PDF document text
    • http://platcometals.com/images/file/96844755443.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/zetuzoxefumeburolulujegob.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/62256242848.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021925343545387.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/33293348042.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jevvetp7r9ibvq2ahjluessl21/14015794021.pdfIn PDF document text
    • http://babamoleskine.com/files/file/88505737834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=larimer+county+booking+searchPDF 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_off0000b4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D7 16352 bytes
SHA-256: 8641c7c24d26f4df8b4ef57bbeb6d98b9ffc137ee8fd11a9ff7a9fdc07da6348
font_01_sfnt_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 11032 bytes
SHA-256: e323a0426796ecd7f594728334c3577d6e22bbdb1cc9f0bbcd83bbc0bf22d291
font_02_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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