Malicious PDF — malware analysis report

Static analysis result for SHA-256 052e643fb000ace3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 05:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bfbc95be8fc67308ccfb7090d87154a SHA-1: 577df4a35cde74ea3f9be531b95099c75ec219a6 SHA-256: 052e643fb000ace3e1047ee6be6034a1fdaf9bd76a0b8ceab637e1a0893a595f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/28377797467.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142876733ea2---rugatedozufogifirikokun.pdf
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/78307734060.pdf
    • http://articolo17.it/siti/usr/foto/files/dugekafixudalufufeju.pdf
    • http://lsphc.com/userfiles/file///foroludimujudobi.pdf
    • https://redac.ch/upload/mosemoz.pdf
    • http://www.asap-recruitment.net/upload/file/60998596718.pdf
    • http://builderall.info/userfiles/file/kavebujobupesok.pdf
    • http://maskaevlawyer.ru/userfiles/file/kowozoluvafotijesidi.pdf
    • https://martensmgt.com/business_school/uploads/file/51262105502.pdf
    • http://saraswatishikshamandir.com/singhania/downloads/file/52629541756.pdf
    • http://electrogalicia.com/electrogalicia/recursos/archivos/majisafalavomumejixomugi.pdf
    • http://condosworld.com/abisol1/userfiles/files/wewipezeras.pdf
    • http://proreferee.ru/uploads/ckfinder/files/16947303836.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/72019468758.pdf
    • https://kaptenhoki.net/contents/files/zibutusegavatepidexememe.pdf
    • https://12shio1.com/contents/files/vedunevema.pdf
    • https://worldcastlive.com/userfiles/file/26202835289.pdf
    • https://ibextrail.com/editor-images/femotubegogajiz.pdf
    • https://responsible-tourism-alliance.com/content_file/files/40920796882.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/kuroka.pdf
    • https://fleschimmo.lu/userfiles/files/ligajiwapesijofavoroguzor.pdf
    • http://pazzo.jp/js/upload/files/sejokajiniretok.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/jazodokadulibuwemidivuru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=temple+run+2+video+game
    • 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_off0000c763.bin
fe4fc159aa7cb3e3355ceb3cb33799c5e7577b573e90864258becd702d92b306		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC763 16716 bytes
font_01_sfnt_off0000f2d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 16792 bytes
font_02_sfnt_off00010af0.bin
1bdca68ef0525353673c29f294e9f22cc55abcbdb06e1881173737892a0fc3e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 10716 bytes

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