Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d01d8c8d92ae3d1…

MALICIOUS

PDF

88.1 KB Created: 2021-09-22 19:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f998cf3f3f607bb5b5a6d479e209d1ae SHA-1: 9fc1e901eaeb7c9ee630c28c245d50a591fa1dd7 SHA-256: 4d01d8c8d92ae3d1dc2563dfe8866f1e34c9ad6cd3f71c870d8e75eb99d7263b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://pobierzplik.pl/uploads/files/lisumuzobuziz.pdf In PDF document text
    • https://ever-progress.com/upload/files/78258662010.pdfIn PDF document text
    • http://bjjiffy.com/upload/20506107319.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/magidifus.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/24250920768.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/btk7uih0ou6bnh0pg0l9pp6bdr/mejusasemi.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/disulirapadolijiju.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/galenalipotufekofafilaj.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/47992944152.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/fuvopubemuxadesegomud.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/45860838058.pdfIn PDF document text
    • http://thevalleytrader.com/files/mapevonevaniseteki.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/jirujinizom.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a427c4b18---31595316869.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/10239595665.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/50204238313.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/dogevijenevumipavud.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/38925102904.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/pebepo.pdfIn PDF document text
    • http://belovosushi.ru/files/90216887760.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/80274698256.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/taxuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=apps+watch+movies+with+friendsPDF 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_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 10972 bytes
SHA-256: 676ef29c49b2f3f687e122edf540d06dfbbb3502da16142f1aa9b14d69ef1b05
font_01_sfnt_off00010e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12626 17596 bytes
SHA-256: d02dd9ed8459800f15327aa97d0cb63a03e88e2717d2acc56bc54758640b39d1