Malicious PDF — malware analysis report

Static analysis result for SHA-256 e003cfe6c4be5e5f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-13 12:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41ab13583f51407b46205f69d38d5ed1 SHA-1: f5b6feb60259e9107e1c1259501152ce1dc16d43 SHA-256: e003cfe6c4be5e5f7077d2d9c002ad2d1fa24bf822009c20444017bcf86562eb
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://epgeptech.hu/ckfinder/userfiles/files/86916644760.pdf In PDF document text
    • https://navoloki.mebel18.com/uploads/files/zumukigogolaxesalidi.pdfIn PDF document text
    • http://langyupharm.com/upload/files/lemoj.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/29305994619.pdfIn PDF document text
    • http://didopack.com/files/63694965565.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://ppfi-online.com/userfiles/file/97947104834.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/57829852797.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/maduwu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613070681e662---90142453712.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/togajosidif.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/69649120978.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/80093830028.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/1506950890.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/wunimufaduj.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/4105370118.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/liloguropidofonen.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090900354073499.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/gewiseduvozegojija.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/13038173672.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/57861703633.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/20893282475.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/71016615460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=carb+cycling+pdfPDF 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_off0000baaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAA 16344 bytes
SHA-256: 9b4d674710bc74a53d563e02a836ee2ff239a1f3797f5433dd79da798a8efe1c
font_01_sfnt_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 10560 bytes
SHA-256: f8d0224d89ffc7a7cd333c62c9a2982accb95b69307245df8b34d6c2fa0ad5ab
font_02_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1