Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c4671acd02e37c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 21:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8e34c96658b5f26b4aba8ad2b222b9e SHA-1: 684a147e6a4b1f175c7725cfbbac8c72b5529b9f SHA-256: e6c4671acd02e37c613d6e8628b154037618334d61bccc6363f4c979206319f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a significant heuristic identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially harmful content or facilitate SEO abuse. No scripts were extracted, but the presence of multiple external URIs points towards a phishing or content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fatfailogistics.com/fckeditor/files/file/jidigulebeg.pdf In PDF document text
    • http://sushi-belovo.ru/files/8870119790.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/jadutinuxe.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/2536223877.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/jasisedegerogusizotumer.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/pawowufinojiv.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/lulovuxepolafo.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210915151358.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/67702853811.pdfIn PDF document text
    • http://hoachattn.com/image/files/83646020732.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e23f705a1---65496716469.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/74598755396.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/zazuxemaromujokom.pdfIn PDF document text
    • http://unityproductions.com/upload/files/13785318929.pdfIn PDF document text
    • https://shibbirs.com/media/files/59890151631.pdfIn PDF document text
    • http://speckrepej.com/upload/file/59770238084.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/51098976416.pdfIn PDF document text
    • http://xfswchem.com/upload/files/julilimakugifojixiduw.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/padapapil.pdfIn PDF document text
    • http://sro52.ru/uploads/files/41331106516.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/farupodevexuwilamez.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/97548385840.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/81003076921.pdfIn PDF document text
    • http://warehousetraining.ie/images/gutoposadipefapef.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3008f01a---31589044190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=send+high+quality+video+androidPDF 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_off0000b09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09C 10860 bytes
SHA-256: 6f14ab744defe88ca85d081134a77adeee9846d857080340d20cf8c6a10e8c44
font_01_sfnt_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 15864 bytes
SHA-256: ce96778134b83614beeb22eae00fee761d0dbc36bd4aada4dd60a19b031b1295
font_02_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1