Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c497e7e3a362bb…

MALICIOUS

PDF

68.1 KB Created: 2021-10-03 20:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: eb92e4647353f20969f0305c42714263 SHA-1: 368e4f00ba058abcf4f15269c6bee89352e667ed SHA-256: 14c497e7e3a362bbcdc545e53a5d4484a9732ced648015b28a02fa9bb10caba4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, a common tactic for distributing malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to lure users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://krisoc.ru/uplcv?utm_term=early+church+theologians PDF link annotation
    • https://sitpchemcieszyn.pl/_sitpchem/file/27557490619.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/22199341405.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/52420536606.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/85885815820.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/35014172843.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/18392222526.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/52882485397.pdfIn PDF document text
    • https://invest.pl/userfiles/file/vawekaveruz.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/kiwawadewafolanonevo.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/34433776970.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/41845535115.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/suxuzusemolanidewirimis.pdfIn PDF document text
    • https://equinox-e.com/upload/files/4167504334.pdfIn PDF document text
    • https://vzglavniki.net/data/file/mudunosudemijamamufuwo.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/zodado.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/nusemefoleluziwajufela.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/xuvoxifo.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/pijulejiwivurozofo.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/jekegi.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/16325125663.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/xinipofefomopigumagikul.pdfIn PDF document text
    • http://tzsunup.com/upload/rakabilegumexusami.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/22762515622.pdfIn PDF document text
    • 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_off0000ad41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD41 10704 bytes
SHA-256: facf6ed6d437675e29d21cc5d375f6af8a5e12f2696356ad9530dcb77cf07dde
font_01_sfnt_off0000c5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CF 14724 bytes
SHA-256: b33c654709b02618ee8ff7288cadcf08b9a3b0c887fb9ee31f45b248c2e4da2f
font_02_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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