Malicious PDF — malware analysis report

Static analysis result for SHA-256 3023a16e3ced260a…

MALICIOUS

PDF

87.8 KB Created: 2021-09-18 21:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 54cd392d58901781431d6950dffaf45e SHA-1: 59edf2f1e4ade5ef292917e067425dfb335b229e SHA-256: 3023a16e3ced260ac90734dc4dd25b74f0be7e30ce3db1990ed8c6301c6d7551
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially malicious content. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a tactic to obscure the true destination or distribute malware. No scripts were extracted, but the primary attack vector appears to be directing users to external, untrusted websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://crewmak.ru/uplcv?utm_term=best+free+room+escape+games+for+android PDF link annotation
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/doronaminimu.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/87803387594.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/parividurevugimovidunibe.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/sowofinisiwovede.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/gubipilon.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/64938535533.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/802768c35d48241c8bb0dacd87e0d796/parixim.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/77276175940.pdfIn PDF document text
    • https://ocw.tw/uploads/files/reneboxogonisarawarivi.pdfIn PDF document text
    • https://kvizek.excore.hu/ckfinder/userfiles/files/30634233853.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/72848664556.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/forapojizutabodo.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388cf5a5303---21628576261.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/6261315629.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/sokonopaxi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/36029621305.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/79997724381.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/pifirotojitog.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/65307031121.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/ritej.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/33727857288.pdfIn PDF document text
    • https://duel.pl/userfiles/file/31679728491.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_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 10968 bytes
SHA-256: 67e2d28f86ffc6f741bd6d19c8751ed789cc34b406e33370b1e4c36e21559fe9
font_01_sfnt_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 17512 bytes
SHA-256: a356301006d3ef4586476293f898abe784b665868448bc9bc410e78aa9c996c0
font_02_sfnt_off0001382d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.