Malicious PDF — malware analysis report

Static analysis result for SHA-256 892f552701e207c4…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 06:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5147806b559cb45b1243fa26d48644ea SHA-1: 3a2ecbb54904d645e9036f9f94cf7e108deea2e7 SHA-256: 892f552701e207c4da29dba87f033a7f0c57b79623925f7981bea932a9cba966
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or credential harvesting operation. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=how+to+find+saved+pdf+on+iphone
    • http://abnig.friendship-match.com/upload/files/sanojasefifax.pdf
    • http://telek-trans.hu/editor_up/zojedipofafepezo.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/2803476658.pdf
    • http://saeronbio.com/userData/board/file/xesaniwakuzogatogezebapug.pdf
    • http://nhagiatxanh.com/public/default/ckeditor/files/27525523905.pdf
    • http://elencostruzioni.it/userfiles/files/10661003937.pdf
    • https://groupunsur2.com/contents/files/77156644891.pdf
    • http://asliev.coco1490.com/upload/file_folder/file/94829633399.pdf
    • http://bscartridge.com/pic/gukezivulafaxedenoxewuva.pdf
    • http://laibros.com/ckeditor/userfiles/files/65966713556.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/tubasavuxen.pdf
    • http://bebsulmare.com/userfiles/files/narefose.pdf
    • http://suspensionestg.mx/userfiles/file/nikevijozenutem.pdf
    • http://eatoceanic.iorderfoods.com/uploads/files/44753921164.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f479c90fc0---71011155081.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/27704085446.pdf
    • https://greenfins-thailand.org/uploads/file/35424361851.pdf
    • http://bouwbedrijfansing.nl/userfiles/file/85008452138.pdf
    • https://plantbiochem.com/ckfinder/userfiles/files/55483036975.pdf
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/xaguwabojujila.pdf
    • http://rubivina.com/Images_upload/files/suramevidepud.pdf
    • http://birizgardenhotel.com/userfiles/file/92543045794.pdf
    • http://wolfpackbasketballacademy.com/content_docs/75079368254.pdf
    • http://newbusan.net/FileData/ckfinder/files/20210915_EBA1EA2A6AE4543F.pdf
    • https://escolaalfa.com/userfiles/file/riwoguwedaresevuwoveleg.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_off0000b061.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB061 16792 bytes
font_01_sfnt_off0000c878.bin
500664705008e0afe58fa3039caa59eadfb2002dc8770723f65444e50d948a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC878 10592 bytes
font_02_sfnt_off0000e09a.bin
c3146aaeb614e9a961414856c2069a7f2e188480507b6bf1e8df82305ad458f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 14940 bytes

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