Malicious PDF — malware analysis report

Static analysis result for SHA-256 c802a7728b207fa4…

MALICIOUS

PDF

84.0 KB Created: 2021-09-12 07:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5678ab925c5737a71f3cef71371f62e SHA-1: 08702f5c8516f6480a84ffc6da0294a1462adeee SHA-256: c802a7728b207fa483a47d8901fc13d1401f23801005d30639858e78244c036f
166 Risk Score

Malware Insights

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

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. The 'SE_CLICKFIX' heuristic indicates the document likely attempts to trick users into executing commands, a common social engineering tactic. While no scripts were directly extracted, the PDF structure and numerous embedded URLs pointing to other PDF files suggest a multi-stage download or redirection chain, likely initiated via a phishing email attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://deycaterers.com/ckfinder/userfiles/files/bitivadeli.pdf In PDF document text
    • http://shinies.ru/img/lib/file/97438310187.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/48082560896.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/taxomizul.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/44787825969.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/7563785176.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/60521501322.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/towud.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210911222859.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630527517.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/nuvukovizurowibugafe.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090300521573499.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/lisudasuvelegiwejowediz.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/jomof.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/69311460227.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/kixusariledosupamulekejab.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210912100452.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/posuvaxajixusedul.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/xapebakivax.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/26948590942.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/misojulid.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/cbed57f0059a17e6356fc171bdcd4100/35609778700.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/qo2hec6m0j263q9ebpoimqfuc5itc33v/55176381343.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/raloxaduvisesola.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/76653948286.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/58892087254.pdfIn PDF document text
    • https://noddy.nu/images/file/xopomesesili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=minecraft+game+free+download+java+editionPDF link annotation
    • 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_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 10924 bytes
SHA-256: b54c11d9cbfa7287e90adda482cdb189c890f811ffb2ccb7570fb6354a5feed4
font_02_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 18984 bytes
SHA-256: 044be2fdbb4945942c4fe0ef3543aba1a104055a151361e188738e5f2e550d3c