Malicious PDF — malware analysis report

Static analysis result for SHA-256 509a43f077bea393…

MALICIOUS

PDF

73.8 KB Created: 2021-06-07 05:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b1a8a0abddec744f13b62af79fcae5d9 SHA-1: 0b65cc4645cc130b19af26c618d70a1add216b38 SHA-256: 509a43f077bea393f4bc3b97a71acae2099aabd04be8f962830ff96cc6d6a1f7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'Dreamstime free images' and 'wkhtmltopdf', likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/123?utm_term=dreamstime+free+images PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379987/normal_60183ea470808.pdfIn PDF document text
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/nefig-dupef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454055/normal_6063498b1c7ee.pdfIn PDF document text
    • https://kekisadubivef.weebly.com/uploads/1/3/3/9/133986731/pudatu-lepogu-tebanogino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_60556ed5e6bb7.pdfIn PDF document text
    • https://vekoduxiboba.weebly.com/uploads/1/3/1/3/131398498/lokajowotebe_mebikagovus_giwefivamunop.pdfIn PDF document text
    • https://kowupozot.weebly.com/uploads/1/3/4/8/134887449/e3873ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476757/normal_60520fe36104a.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/nizifidizoj.pdfIn PDF document text
    • https://nibobesexetew.weebly.com/uploads/1/3/4/2/134266191/6e3b47b11.pdfIn PDF document text
    • https://rixedevo.weebly.com/uploads/1/3/5/3/135306589/6444395.pdfIn PDF document text
    • https://nezafilajulimef.weebly.com/uploads/1/3/4/4/134481311/18baf1ca2.pdfIn PDF document text
    • https://jobeluraxofedir.weebly.com/uploads/1/3/4/3/134317239/begofixuwo.pdfIn PDF document text
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/77442.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d915c9-b543-4be7-b1a2-715d77ebb4fa/united_colors_of_benetton_origin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5365120d-d2e0-4e1c-90af-55364247c0d3/vinurivevepizudekuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a10dc46b-56cc-414c-89fc-c6b09bf50fec/fiwogedobalesajalezal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4edaa65d-de6e-419a-a1c4-5beec35bee5b/whats_the_best_space_heater_on_the_market.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 5056 bytes
SHA-256: 4ca106c0db6ec1d0bf181aacd01747e128214b633a39ffe0f26f549b86192358
font_01_sfnt_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 10464 bytes
SHA-256: f90a475b54acef8736e62774d86ecb09161e6a809e278f40fc8ac95cec00169d

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