Malicious PDF — malware analysis report

Static analysis result for SHA-256 add26d579b7412f0…

MALICIOUS

PDF

78.6 KB Created: 2021-09-14 21:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e091090b9ea80245087b5f7a5173900 SHA-1: e616c444dcfd70b546839316e07ff9a27ebe274d SHA-256: add26d579b7412f0206a849e277cbecad75952a31127b48c21ccb09a2368f53a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that has been flagged by multiple heuristics, including a machine learning model and ClamAV, as malicious and likely phishing-related. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=throne+of+atlantis+download
    • https://biroestarsa.hu/uploads/file/70377623527.pdf
    • https://skinrepublic.vn/webroot/img/files/zimamaxuwifazox.pdf
    • https://basisnomor.com/contents/files/10355425952.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/89629989162.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/tavoxaside.pdf
    • https://psychologgia.pl/Upload/file/26261808199.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/solipuvojubosevupudo.pdf
    • http://delve-cr.com/uploads/95322910525.pdf
    • http://www.awakohchang.com/image/upload/File/ubexabozenisowulenenilo.pdf
    • http://benthanhsgfarm.net/images/uploads/files/bazisomadevepemib.pdf
    • http://ingatlantv.tv/userfiles/files/95374688318.pdf
    • http://hingliltd.com/userfiles/junagi.pdf
    • http://katyababash.com/images/uploads/file/41434098780.pdf
    • http://inventory-acepipe.com/images/uploads/files/21038641983.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409071a0fab---sudolexi.pdf
    • http://findmecakes.com/userfiles/files/merasiguzimew.pdf
    • http://tylincms.com/userfiles/files/lefowopedise.pdf
    • http://newtarrytowndeli.com/uploads/files/mimumada.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/jokogajaroxuvurekimaxajo.pdf
    • http://stnicholasway.com/userfiles/file/kejimuwidanefuxov.pdf
    • http://kaupa.cz/userfiles/file/xudugum.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc2fdd33cb---75674158024.pdf
    • https://rzfmuhasebe.com/userfiles/file/pigojizavumapep.pdf
    • http://pyramidplaster.com/file_media/file_image/file/13271682143.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/57511703371.pdf
    • http://giadinhlaurenso.org/upload/files/93773287757.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_off0000cc2a.bin
fc516dfb36d02cbbfdd36349f510a22c901493eb6a0ffd1513ae426b88f74297		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 10500 bytes
font_01_sfnt_off0000e407.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 16792 bytes
font_02_sfnt_off0000fc19.bin
ae4721cde701ff905d7255b377442f7b94423cdcd47f19d8d6adf738395fbfec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 18756 bytes

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