Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d53949a35f09e9e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 16:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e935b6b03d25adec7da2075c967d97c SHA-1: 26a455fe9faa8da47a5fc229ac3df8fc007cb93f SHA-256: 1d53949a35f09e9e9e8e7e8d6a1d4fbb9d6f4ad26ae36fae4d05b46d3340fc30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the true destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's purpose is to act as a redirector. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/bipabovirixik.pdf In PDF document text
    • http://schokobrunnen.com/idata/93780371289.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/49451742540.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/tijinojizibak.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/36968631424.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/xijid.pdfIn PDF document text
    • https://digireg.nz/upload/86801899134.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/sukag.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300887c459c---potitudaluvulevizanof.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/20504534243.pdfIn PDF document text
    • https://taperagi.com/contents/files/lewifugixiroz.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/rozasozajuxevaxatomevoro.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/60770864510.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/85179047339.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/rorefafesazojewafo.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/paxidamipobot.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210901182523.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/412a673c4f86528aa5aed18e96af9fe4/50806265470.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/23559758182.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/xusabopevofafadolal.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/92579871969.pdfIn PDF document text
    • https://10fci.org/userfiles/file/dipomuwo.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/niwomok.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/26984131667.pdfIn PDF document text
    • http://szwygs.com/upload/bazeginilatibasaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=whirlpool+dishwasher+manual+filter+cleaningPDF 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_off0000d672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 17596 bytes
SHA-256: 05b11b231e1f68f34ca1e210829a81c3d201176eef2b610a7196e56e083cf590
font_02_sfnt_off00011bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 11244 bytes
SHA-256: 633cf362d9a6491b45982e4c71e8f4020f5f4004c5ba527df0fabbe8d28be3b1