Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d31afb9c982c0c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 10:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 418b29cad4aac4ff3b57141d89b15187 SHA-1: b08b889f10cecab0ba5cd4b3260942ab16eefd31 SHA-256: 80d31afb9c982c0cd885b3cbee5aa1bd82a2789557cdb7d9a56f94f9fbe5f618
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inwebjor.ru/uplcv?utm_term=how+to+view+hidden+wifi+password+on+android PDF link annotation
    • http://adbuilder.at/ckfinder/userfiles/files/padakubemek.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/lusugisisaponukakevevo.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/gezoxumev.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/pedigojemewomuxegumunox.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/72124957374.pdfIn PDF document text
    • https://labelmarket.eu/data/file/43720671672.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/61521955622.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/27950110368.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/betisuvewuzibuzisisinag.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/88941913316.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/21436270967.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210902file///naganukinobi.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/wejesifu.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/3218345018.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/rekuzizotevojim.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/30916007997.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/57745779950.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/sagexufedimubuxivasago.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/610116bb33dca10d8701f92271cbce90/56646868798.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/30566969155.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/gelima.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 10692 bytes
SHA-256: d76cceb1b4d2c8854a569fa0675d06f33fdcdb3408db7806a15ed5b7d8dacf63
font_01_sfnt_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 17648 bytes
SHA-256: a001239aee08def7923ff60b90a0add83f653fc86da45d54df30ad4a347f1756
font_02_sfnt_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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