Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4c13a27a231b06…

MALICIOUS

PDF

71.9 KB Created: 2021-09-13 03:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 858e6d5738426606d13a58256397af38 SHA-1: 14fdd7efe722f8124f5cf8c0a7814d2be836bf14 SHA-256: 1a4c13a27a231b060f0ce35dbb118c9a5bdc731d7839c377f312b4baa36cdd37
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the PDF's primary purpose is to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kurtoglumob.com/upload/file/7697767996.pdf
    • https://www.hsbofmn.com/ckfinder/userfiles/files/gixebepenudepibutamas.pdf
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/bajekizufumekowit.pdf
    • http://market-oborudovanie.ru/upload/file/47007930133.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d246895d94---47445866528.pdf
    • https://www.terraton.com.my/ckfinder/userfiles/files/zokoli.pdf
    • https://dpengineers.info/admin/userfiles/file/gadadetut.pdf
    • http://sincaremedicaltour.com/js/upload/vovorabozi.pdf
    • http://wxmx.cn/upload/ckimg/files/202109032224522228.pdf
    • http://fxlcd.com/upload/file/lekijawebulopod.pdf
    • http://dom-2000.ru/ckfinder/userfiles/files/71491186532.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7aedba2ae---tiludagalitafurugolubepam.pdf
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/gijilu.pdf
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/84530207889.pdf
    • http://www.pzkexie.com/up_files/file/kajokabezi.pdf
    • https://csam-villepinte.org/uploads/images/file/xasubufevewawokafofirukor.pdf
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/ximida.pdf
    • https://ustunbilgisayar.com/userfiles/files/jopavaxivivirobozawet.pdf
    • http://deleersnijder-bocaege.be/images/file/2775803539.pdf
    • https://4cmedica.com/ficheiros_upload/file/82690002949.pdf
    • http://sentai.cc/data/file/20210912_041909_198.pdf
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/68978185114.pdf
    • http://anabakorea.jp/userfiles/file/74276039953.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=blob+emoji+keyboard
    • 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_off0000b48a.bin
ccb3f80ff44ac27c08761fff2448b026f5a90303c4edd4c2157a0548e1549a2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB48A 10568 bytes
font_01_sfnt_off0000cc90.bin
3535bee811c5ab7bf58a92d931d1c28fc35c2a86e025af53c648fe01e603ce46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC90 17672 bytes
font_02_sfnt_off0000fa3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 16792 bytes

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