Malicious PDF — malware analysis report

Static analysis result for SHA-256 b700b297f5116606…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 12:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97e09c19a6e82e903a65f29a9d337a4d SHA-1: f00d28ede1a865031a6bdea27c35fa84e6b2efd5 SHA-256: b700b297f5116606622df9abcb854dd97335a885427a7236fd60176ca557fedf
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. It contains numerous embedded URLs, with one identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and the embedded URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://ahcxdq.com/uploads/file/030624381930.pdf In PDF document text
    • https://architektor.ru/uploads/file/gumonudujazutumonuniduz.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///wegafagijewelejalebi.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/webilawirowerodavegab.pdfIn PDF document text
    • http://labotinnghia.com/img/files/73499821164.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/20804185134.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/kirapokitekop.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/31087945850.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/ronopiguseviramitipun.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/14846004723.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/damopu.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/nufoxiduwaj.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/63871662300.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021e74617d---71688591214.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/ruvavufizis.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1587c44e4e0948bb02f282b35130eae8/tozalurudakavab.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/25692720798.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/guvobepidadanebapepo.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/zutevugejilarowibix.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/pawelaxewomezare.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/wojusidaribazo.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/xojefi.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/gonuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=story+saver+and+video+downloader+for+instagramPDF 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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 17688 bytes
SHA-256: 35cc67a9546c3fd0d483f920fc1c4e4ada70b62f914328ebf7daf77d5b224eae
font_02_sfnt_off000124de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DE 11036 bytes
SHA-256: 2d90e0b4468f80f3f93a33af260fdd46f3abdacf34f21452d4bdda4114bac348