Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41141359056a5df…

MALICIOUS

PDF

71.2 KB Created: 2021-09-10 02:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1bb300659df59224a7416bf979b68049 SHA-1: f42a6343c2d56d3f3337b813eda28ccb3b2b43bf SHA-256: b41141359056a5df98d76275e04854c95e235d907d830aa16a5a06c33b31fc45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malware distribution attempt. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=display+multiple+time+zones+android PDF link annotation
    • http://litho-and-co.fr/ckeditor/upload/files/juromozisibokaxut.pdfIn PDF document text
    • https://tekartltd.com/upload/files/64706774703.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/gefudizesazuxubi.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-05/images/files/74322196501.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/82147572471.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/50564858138.pdfIn PDF document text
    • http://linza-market.ru/upload/files/bedivonu.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/wajumupigelofutomegi.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202193036413144.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/14854953872.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/tosuvofiwigi.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/doburanilipuzulozoze.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/penow.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/mejezizozuk.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/zomezebono.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/27806310526.pdfIn PDF document text
    • https://people11people.gr/uploads/File/88896144498.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/31865096879.pdfIn PDF document text
    • http://grimastone.ru/files/gonulo.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/47820714541.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/pujixajexefifido.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/sezixonuwer.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/42961801653.pdfIn PDF document text
    • https://kede.org/userfiles/file/34499367514.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/23558945708.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_off0000b48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48C 10828 bytes
SHA-256: 95866a1ccfc6d71faa3835063e68d931412473c009b9ba598138ff30becb4655
font_01_sfnt_off0000cd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8F 16280 bytes
SHA-256: 5fb665e16d29fef06fc82583d983555c96c651aa9c099e03893958ec6cd6a34c
font_02_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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