Malicious PDF — malware analysis report

Static analysis result for SHA-256 112617f92a324cd1…

MALICIOUS

PDF

90.4 KB Created: 2021-09-13 19:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1ae355191b98fccdfca07bd87ad7327 SHA-1: 1e3ed1941b19a586460b4d4b1d2cdf439744857d SHA-256: 112617f92a324cd11df2c389c5a7959aff693449bcfe34e17320afe275d6f5e7
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 external URIs, many of which are hosted on disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate that the primary function of this PDF is to redirect users to potentially harmful external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=i+got+the+hook+up+full+movie PDF link annotation
    • http://avalon-essenzen.at/userfiles/file/55707895546.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210912_C4258DABAEA98313.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/vebisosowuri.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/79021890684.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/wubadaje.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/lakajufepujomezukididujo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0aff2b7d1---javidometew.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/moxodezukejatuwedepagixi.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1730809606613da9727afc4.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/welipaf.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/dosupuvopajojet.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/42388462045.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/11129450139.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/pufinibakizolaxofujapoku.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/87348772671.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/13207668795.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/xokato.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/razar.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/zedoji.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/gexixapodinijulojuj.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/winakefo.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/losufipukonubaxewabap.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/dinetupemojusitirosikam.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_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 10480 bytes
SHA-256: fdc943ec1ff23873b4c4615b2766e5de5b65b89d3a41e938099521b02e99fe03
font_02_sfnt_off00012fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC8 17228 bytes
SHA-256: e372b709d3237d7b5b3da8f86c94abf3c7fbe55c4338c6b7a46f23b71c929a14

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