Malicious PDF — malware analysis report

Static analysis result for SHA-256 8951bcaf176d1237…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 04:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1cacae2bd3e23c4f925796befd29794 SHA-1: 6eae5147966331ebaeeb9f288bc66c2607c3e612 SHA-256: 8951bcaf176d1237aabdf73daeabed32df3b701383161e535e7d7025d2fd0405
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. The PDF structure and embedded URLs suggest an attempt to redirect users to malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the presence of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=israel+houghton+feels+like+home PDF link annotation
    • https://hamzsabegi60szallo.hu/UserFiles/File/lidawodevoj.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/77811597260.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/64021134548.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/21066171517.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/limuxitafilowam.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/jovina.pdfIn PDF document text
    • http://osayit.com/images/file/jajusukenowotudokovuz.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/33158982858.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/tujabekatonibopibani.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/35999775582.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/68063111219.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/68749788411.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/9915317812.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/84575726866.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161446938d65f2---35798589525.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210912065546.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/2153915066.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/17957461420.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/bolonokunebaminulu.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/17496150312.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/raxuwavux.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/92841869567.pdfIn PDF document text
    • http://vpsystem.com/files/fck/jevobibutalil.pdfIn PDF document text
    • https://12shio4.com/contents/files/25864379301.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_off0000d693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD693 19452 bytes
SHA-256: dcd440d0bbdc8a929536bde7e5f3c24e84fb8c50c51ee52ff477b64489c1ce1b
font_01_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 10804 bytes
SHA-256: 9624da7393503f080350472d1849c92267a26c507aa679a07589cc1c66e6e236
font_02_sfnt_off00012228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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