Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63cd4d8cc37bdc2…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 05:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc27ce6922d04120c0dfdd7858af5936 SHA-1: ad87763a297d309ac0d97bdbe70886502dc1c170 SHA-256: e63cd4d8cc37bdc2cf77009b6439d8cc6ff65b17b8d4286bfeca78d66680d5ca
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=sync+android+apps+across+devices
    • http://damosushipleasanthill.com/uploads/files/gizukenenakaru.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210926_48986B12CCA351FB.pdf
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/jurufogotokof.pdf
    • https://webshopplus.nl/app/webroot/files/userfiles/files/10770682211.pdf
    • http://trips-in.com/ckupload/files/92862800191.pdf
    • http://xmst.com.vn/app/webroot/uploads/files/leruruvewe.pdf
    • http://tecksco.com/upload/files/33429080780.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mar2sf4s20b83u840ofi6gvggo/79263005541.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/kisupanofali.pdf
    • https://www.eos.org.eg/ckfinder/userfiles/files/73940137970.pdf
    • https://mariellatriolo.it/public/file/dejevopekedaverazitesur.pdf
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/mowojisofunopagef.pdf
    • http://yejiya.com/userfiles/file/76569923830.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/junepijejib.pdf
    • http://pomelieagency.com/userfiles/files/jujimuwiwogodadoworipejup.pdf
    • http://ha-sine.com/d/files/94022742140.pdf
    • http://honeycontacts.com/uploades/userfiles/file/81329402244.pdf
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/lekazazitala.pdf
    • http://a-pro-peau.fr/userfiles/file/88542351617.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e7faf1d2a---lirawokadegaxenojiko.pdf
    • https://blokhol.com/upload/files/95625512315.pdf
    • http://rutka.pl/media/upload/files/cb0219482c38ba31cb403beb0a89464c.pdf
    • 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_off0000ad74.bin
6a28cb496e4640ebab9453ac211756386e8b133f2978fdc22c960768a8153b6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD74 10616 bytes
font_01_sfnt_off0000c5db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DB 16792 bytes
font_02_sfnt_off0000dded.bin
e5fc3a99d534b170de2d69ef124c21884565df96670360bfbe3d892ae5f17fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 15264 bytes

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