Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a1817bf5fb29ba…

MALICIOUS

PDF

71.9 KB Created: 2021-09-10 14:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efc5d391580836e1b273ef03fbac818e SHA-1: f9aafececad20effed965d88f0bfe7499938487b SHA-256: 34a1817bf5fb29ba3b27fdaccc33f7ff0373c7c197857ff200326caa770f6c2d
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, some pointing to raw IP addresses, indicating a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=instagram+apk+free+download+latest+version
    • http://eschool365.in/js/admin/uploadfiles/file/tawaribixapoboborupipa.pdf
    • https://unitedfightalliance.com/ckfinder/userfiles/files/39978910945.pdf
    • https://koparieshorvathbusz.hu/files/file/91887318814.pdf
    • http://phelieuviethung.vn/upload/files/sakobadujonaxo.pdf
    • http://zgic.ru/!upload/files/55926501469.pdf
    • http://caffepontoni.com/uploads/file/gofisime.pdf
    • http://ddservice-bmw.pl/userfiles/file/79134524488.pdf
    • http://paulabenveniste.com/UserFiles/file/sonibemudelajeni.pdf
    • http://mtreurope.com/ckfinder/userfiles/files/wuvijulepuvojuzuner.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210902191043.pdf
    • http://birdwatching.sk/media/file/jasizonekefexo.pdf
    • https://drinkpoint.com/uploads/files/16579811097.pdf
    • https://bankkartya.hu/js/ckfinder/userfiles/files/16054389538.pdf
    • http://jurabos.nl/include/editor/file/wufexeguwagobanenaf.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613480957df79---voloxujizesediwidaxexu.pdf
    • http://smflow.in/admin/uploads/file/7009194875.pdf
    • http://sinostandards.net/upload/files/jawediniziwomazexim.pdf
    • http://fishngrill.iorderfoods.com/uploads/files/wukurinurudani.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a112cce28a30dfd0464f55c818264a2a/7906140059.pdf
    • https://network-italia.it/file/kepenerumiwudime.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/35181812125.pdf
    • http://gtlitalia.com/userfiles/files/tixanifirojazakubo.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_off0000b561.bin
9e48910d49473b34283123c841ede2732262d5b8e6a098ca81f33dcfedd54442		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB561 11036 bytes
font_01_sfnt_off0000cedf.bin
e4b235b62df973294d35ca33736ad58b0495ea0c131198c091c20fafa136614f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDF 16944 bytes
font_02_sfnt_off0000f9d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 16792 bytes

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