Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1e16500f26e166…

MALICIOUS

PDF

74.4 KB Created: 2021-09-20 02:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6346d1bee59a35210f7e40ae317c360d SHA-1: 32118788f610f59733a186f153835b6b936a6939 SHA-256: 2c1e16500f26e166846b46f3a2b5706edecae9847cd1bc911b4a4ec728cce15c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm and a potential invoice lure. The embedded URLs, such as https://irlanc.ru/uplcv?utm_term=samsung+galaxy+a41+vs+iphone+7, are likely used to redirect the user to phishing or malware distribution sites. The document's structure and the presence of numerous external links suggest an attempt to deceive the user into visiting malicious content.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://irlanc.ru/uplcv?utm_term=samsung+galaxy+a41+vs+iphone+7
    • http://fourfoods.com/images/files/21464949347.pdf
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/gasinokev.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613395fe8475f---denogodu.pdf
    • https://wildnaturetravel.com/File/2634988494.pdf
    • http://jiji.pgo.tw/pic/uploads/files/20598277726.pdf
    • http://dfwsedan.com/nbloom/fckuploads/file/70089509268.pdf
    • http://tdvvietnam.vn/webroot/img/files/pivan.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/69335040924.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa15393b2---bujadukuvujujabig.pdf
    • https://kaunas.cvzona.lt/resources/img/files/34430687065.pdf
    • http://blccy.com/userfiles/files/xaxazotixa.pdf
    • https://bbox.ru/images/shared/file/ganodamezevepenuve.pdf
    • https://huangs.tw/uploads/files/202109170728437915.pdf
    • http://tlw.ro/UserFiles/file/mekenugaxamejiwa.pdf
    • https://www.jakketoes.be/ckfinder/userfiles/files/90837346108.pdf
    • https://festival-bg.com/media/ckuploads/files/webamogorafalepukon.pdf
    • https://arendic.cl/files/kuman.pdf
    • http://chieusangducphat.com/uploads/userfiles/file/46232322296.pdf
    • http://sissonne.hu/editor_up/sivowikimunosubupibug.pdf
    • http://hpworld.hu/data/pic/Image/file/16059789237.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/11871423549.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/46833916353.pdf
    • https://indirimlipin.com/calisma2/files/uploads/tuzufogojojedipunolaz.pdf
    • https://alamansyria.com/userfiles/file/7810161902.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_off0000be60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE60 16792 bytes
font_01_sfnt_off0000d677.bin
4b218bbac7e59e8fa3035bc7fee326e2bd1a23afbd3da9d23329aeb5f4a7180f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 11136 bytes
font_02_sfnt_off0000f061.bin
9ad3c6ab949e44a4da738f364322377eb9dfe767810df6e271f80544c9aa5f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 16936 bytes

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