Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4877f312b690beb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 19:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd22f1498c6aca719e93342d6bf0a576 SHA-1: 3c35db029ea5d545490c8b3a5ffc85f183c4a05c SHA-256: d4877f312b690beb649c4a80e798dd0a06017f145ddca7bbec37ff4a34da3418
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://haphadoor.com/upload/files/ripenine.pdf In PDF document text
    • http://hai-bi.com/uploads/files/202109230924217879.pdfIn PDF document text
    • http://enewind.com/pliki/file/bokomujur.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/48318137237.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/welowejil.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/25835083417.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/34554615977.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/pajilazamar.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/jetefefufiwip.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/pimegufadepezajo.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/73400750690.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/8508895598.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/72058784253.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/45917586658.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5b6f95301---21005720379.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/36fc6652eb4a3fad7518ba994e6f5293/45837551402.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/siridifeluti.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/62907533502.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/88169252823.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/74311437632.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/zidifomonobebewupasura.pdfIn PDF document text
    • http://urbariatprasice.sk/upload/file/71321042239.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/50150333252.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/watewawinonubijewawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=two+syllable+words+that+start+with+mPDF 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_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 19848 bytes
SHA-256: 17e72924f535e18a3d5b56f0f0d0380c8a67aca5084543279e91977472276f59
font_02_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 10712 bytes
SHA-256: ae7d5e89b03d09d3aa0e462fda8b2e9eead45cc3c3fd98513237c3ed64a61d3a

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