Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b5bfc584d51f98…

MALICIOUS

PDF

74.8 KB Created: 2021-09-25 22:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 133e132f66b6a3d3618207161a0773f2 SHA-1: 24bc79509a250bf9fa5eb0ba9cb1bfbb97783676 SHA-256: 80b5bfc584d51f98f478f4c55d102c5b230226c0bd44fd577b570220060b716d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true destination by using a large number of distinct hosts. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://koparieshorvathbusz.hu/files/file/10618251990.pdf In PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/28430218941.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/2471129505.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/rojakaroneponotegud.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/giduzafezawuju.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/34400090219.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/bizumez.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/49576106895.pdfIn PDF document text
    • https://raljob.com/userfiles/file/dowobibumifuguvu.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/31831742819.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/fetekejilesolizumosiw.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/raredalikuzelixiwasaz.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/xopijefujesisefunatane.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/77077769605.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/55451718974.pdfIn PDF document text
    • http://hodori247.com/uploads/files/luxadoxidabijajefeb.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210910010834_9pcprg.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/41240665602.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/18524061726.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/lisimigomep.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/24229538115.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/nupuvibif.pdfIn PDF document text
    • http://spiregene.com/image/files/20210919_172025.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/texazomikizewetaxo.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/walidewifopefisoladimite.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/27435926359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=share+android+calendar+with+iphonePDF 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_off0000bb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37D 19120 bytes
SHA-256: cf4b809accc2942188237725487a0a865b2d14b2770548fbb4f2bbb31b0fde62
font_02_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 10604 bytes
SHA-256: de43fbf8795326aba349e5c7cb70e97e1ca2d1cf639b0a806196418cbe3e9b23