Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bdcfb533d638c7…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 10:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: aa971c5d53ce7044b86bf92a836b61c6 SHA-1: 13a614a74da41ef4b398189898a0e6ce16e2a9a4 SHA-256: e1bdcfb533d638c7849ca293bf08fedb798d828fbe7c5b75e1c9a61666c4db05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs were found, with many pointing to disposable domains, indicating a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to host many links on potentially untrusted domains. No scripts were extracted, but the high number of external links suggests the primary attack vector is directing users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/xidanagewobaxulosopusadal.pdf In PDF document text
    • http://locnuocvietmy.com/Images_upload/files/29423952039.pdfIn PDF document text
    • http://beeshark.ro/app/webroot/files/userfiles/files/65268213273.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/wapilisipowizakebibo.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/fadukukixogidifobip.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/68866736497.pdfIn PDF document text
    • https://digireg.sk/upload/79807596389.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/turonuvese.pdfIn PDF document text
    • http://exosushi.com/uploads/files/44094184918.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/xoxagifakorolup.pdfIn PDF document text
    • http://newcityhk.com/userfiles/nipewimovetixegepuw.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/3740263132.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/5092640544.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/maxonagozewiwemis.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/gobej.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210906052558.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/47823721901.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/89890620438.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/rabunaworebopozo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d39566df1a---mesipusimig.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/52472023248.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/998925967.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/vajiwavos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sonic+boom+2+hackPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCC 18680 bytes
SHA-256: 0c0c05531dcbe9a0f10aa57b38bfacb6cbbfc220520b54beca7d4b7ea1f259b6
font_01_sfnt_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 10376 bytes
SHA-256: 0bea332dccad53dabdfbf4031b62ad00e2fe4a7d2fef5b5d812a59c0a429c50a
font_02_sfnt_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1D 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973