Malicious PDF — malware analysis report

Static analysis result for SHA-256 959c4427bd3e0b8f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 23:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c669c2907b871b87b3bac2712ce0d485 SHA-1: d792f208756297c5fda40295a2b8fc19492f4a8f SHA-256: 959c4427bd3e0b8f555707ef150b77ccced08f47600baabcfb9e5cd1f6c2d79e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of multiple external links suggests an attempt to redirect users to potentially malicious sites for phishing or further 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 http://lecostationery.com/files/file/80738097305.pdf
    • https://nieruchomosciturystyczne.eu/files/file/48458686956.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/32615321207.pdf
    • https://sts-cct.com/app/webroot/userfiles/files/29861894129.pdf
    • http://nexxosrealty.com/userfiles/files/zexugopupadawosofuw.pdf
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/jofaxijetewa.pdf
    • https://parklanehotel.asia/userfiles/file/dunupasiwataxa.pdf
    • https://www.ewdel.cz/ckfinder/userfiles/files/13075082805.pdf
    • https://greenline.bg/userfiles/file/sebopebizigel.pdf
    • http://relaxzenter.com/uploads/files/lavaru.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/mexuzop.pdf
    • http://emachn.com/data/attachment/file/sipakenomomabitoxux.pdf
    • http://gardena.crazyrockinsushi.com/uploads/files/lefomipeferulagodoke.pdf
    • https://sanghvicranes.com/staging/media/58132102132.pdf
    • http://gaziogluenerji.com/images_upload/files/67341687139.pdf
    • https://foursservices.com/nbloom/fckuploads/file/vivipufiloteveruwoxe.pdf
    • https://tomas-music.com/contents/files/73846842300.pdf
    • https://protum.se/file/11262369344.pdf
    • http://malabarisproducoes.com/arquivos/files/toxuwovasarobupapimagi.pdf
    • http://locum-system.pl/userfiles/file/16061273094.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eefe27323---jinujiberituregida.pdf
    • http://mistral-paints.cz/userfiles/files/52676187747.pdf
    • http://digitalpolicycouncil.org/imagenes/file/givadukekusegixenuvo.pdf
    • https://stcc-sa.com/motakamel/Ups/files/zetoxumaguvejag.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+install+tubemate+in+android+mobile
    • 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_off0000cc8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8D 16792 bytes
font_01_sfnt_off0000e49f.bin
c9af651f8e0aa4b181233b6129da5a9e591d651302db9e770c429195ab329012		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 17208 bytes
font_02_sfnt_off00011126.bin
b690794d0693bec36a425fad737d9190763973b57b764ff6ff183a7cf279a07a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11126 10724 bytes

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