Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37d17cb36e66520…

MALICIOUS

PDF

90.9 KB Created: 2021-09-14 07:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4c396aff2311cf2398ba1b88bb220f2 SHA-1: cdc7d0f206263266aea7eb87f75059c96210339b SHA-256: c37d17cb36e66520b221e013e5a739c661a8b7c9c8475bebec286c9bb7e5225a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the overall pattern suggests a malicious document intended for initial access via phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 4

  • 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://volnynaklad.cz/data/file/xuriseza.pdf In PDF document text
    • http://fotosvatba.net/userfiles/file/genarikopukagekigowak.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/35795318407.pdfIn PDF document text
    • http://renknh.com/ckupload/files/kekaxe.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/12489863877.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210902050648_996289948.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/tugiwogoru.pdfIn PDF document text
    • http://lagrupacio.cat/file/79556592352.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/50867640167.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/60134646721.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/68003091739.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/kekewizirovajufugamenu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/metawe.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/sodopuwogadulogigi.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/98622544003.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/86514109007.pdfIn PDF document text
    • https://makenie.com/upload/files/zijej.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/22582644913.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090712103_894742907.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/pumopozobusonukagesud.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/zufuwaxewopoluvelesimib.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/vulenipusuvijo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/peguvagex.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/sopigijikatasozubaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=il+miglior+launcher+per+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_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11669 10744 bytes
SHA-256: c8ba451a7e7b9600d785021490bb6ef937956553fde9718564cbe9e9d41e5497
font_02_sfnt_off00012e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E93 17792 bytes
SHA-256: a1792e6da1d103cf660b13da9f9743929320d8ae46aab56e5a58eac9bf59c503

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