Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb6158fc2875fe3…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 14:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a272c8c47ca2042b408f4857b75239c1 SHA-1: 6dc2a651d37b87fe4ef60b5e7f2fe0657134bd19 SHA-256: afb6158fc2875fe33f819d11ebe7fa5e8c322994becb1afe61bb3e9ae0948a3c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-based lure, typical for phishing attacks. It contains numerous embedded URLs, suggesting it's part of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure and embedded URLs point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://2222.netsociality.com/upload/files/66441736020.pdf
    • http://ventss.ru/userfiles/files/xifiwapogizigozumuzelu.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/11351208671.pdf
    • http://controldellaves.com/app/webroot/arxius/file/62369275288.pdf
    • http://acmemask.com/upfiles/editor/files/77401990331.pdf
    • https://okinawa4d.com/contents/files/71074399570.pdf
    • http://linpus.com/app/webroot/userfiles/files/10916715137.pdf
    • http://www.amedna.com/userfiles/files/82947589672.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494be1f22d6---momogadifuratebozox.pdf
    • http://elpijisystem.com/file/jinapusago.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd2271a2f---56279430131.pdf
    • http://architectureanddesign.it/userfiles/files/31499153006.pdf
    • https://caror.hu/ckfinder/userfiles/files/kikikuzebosoduxexepife.pdf
    • http://taispacedesign.com/upload/files/80921695835.pdf
    • https://batikatravels.com/userfiles/file/lowogepesasuku.pdf
    • http://tonioloclaudio.it/userfiles/files/dotesirorure.pdf
    • http://mezon.jp/userfiles/file/63853394366.pdf
    • http://vlajkylevne.cz/UserFiles/File/naralepevoxaroteb.pdf
    • http://uslugi-ogrodnicze.pl/pliki/File/58284140160.pdf
    • https://syteq-pro.com/userfiles/file/kezejifurazazawu.pdf
    • http://veganogle.es/uploads/ckfinder/files/noxoxajevobejozo.pdf
    • http://kitpaisal.com/mypicture/file/duzamosusedabek.pdf
    • http://scandirent-new.ru/uploads/assets/file/49363976023.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=harry+potter+mod+apk+gems
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b07a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB07A 16792 bytes
font_01_sfnt_off0000c88c.bin
5b7139d7898903ec7ca78c39e56060af1ca44633008792e556af3ba6195828a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC88C 14224 bytes
font_02_sfnt_off0000ebbb.bin
cd68d4a8ad447019b0416827b3c8a00acf062dd94e2977a6013dfccc95ad2df7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 10688 bytes

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