Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a501e39f4346c7e…

MALICIOUS

PDF

75.3 KB Created: 2021-09-13 13:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d91af4328b470183f7eb00d81b18553f SHA-1: 6d96a895bad0150ec84b9d7d5ce020dd3b1c6160 SHA-256: 4a501e39f4346c7e3a10c3e5f2f310e42f06be11e7f866d5f1ce80b0bb0eb714
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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=the+bachelor+australia+watch+online
    • http://membranekeyboard.pl/_data/file/19902001905.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/48cf4c2635dcf950f2cd86d5042e4329/tiborijirova.pdf
    • http://hitelesen.com/userfiles/file/purez.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/26166333439.pdf
    • http://fashionflutters.com/ckfinder/userfiles/files/ditevusojawuvam.pdf
    • http://galettedesrois.hu/userfiles/file/60682839786.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161302739aa3b1---dubawoxozezomemowix.pdf
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/18006394281.pdf
    • http://portableandcool.com/files/files/kojoxojemuzedivan.pdf
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/boduviduj.pdf
    • http://ilkyoukais.com/Images/Media/files/fafekutojija.pdf
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/zadumeturojofobojapabugo.pdf
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/modirik.pdf
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/64240697929.pdf
    • https://tort-art.ru/userfiles/file/xomibixev.pdf
    • https://ispartaorganizasyon.com/ckfinder/upload/files/47386675442.pdf
    • http://loadcell.vn/Images_upload/files/zuwevuxegan.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/43171841779.pdf
    • http://onlinetradeshow.ir/uploads/files/19856872160.pdf
    • http://shiraz.sk/ckfinder/userfiles/files/2254549156.pdf
    • http://khangvietdn.com/uploads/file/51661779022.pdf
    • https://subarini.ro/mm/file/15888100375.pdf
    • https://hgindustrial.eu/userfiles/files/92817618145.pdf
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/norunetu.pdf
    • http://gsemilia.it/userfiles/files/jesurebimomisibuniwan.pdf
    • https://egyseg.eu/ckfinder/userfiles/files/dukaxodunu.pdf
    • https://oklogistic.lv/upload/file/13738272673.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_off0000c537.bin
169918021fbf19c7d57cee6cb5f64811cfa7bc4703480144ff7ab3429fc5e6b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC537 10616 bytes
font_01_sfnt_off0000dd84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 16792 bytes
font_02_sfnt_off0000f596.bin
a648790769345b3ed52828b19f0a83daf8db07eee05e1a082912d41a4b070f13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 16168 bytes

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