Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7eee4ca9b7fd95…

MALICIOUS

PDF

79.5 KB Created: 2021-03-18 17:51:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ffc42fab24bb352b1ac8aa59bf39681c SHA-1: dec9770e666078684e1b308fa7680bb1f37268b9 SHA-256: ef7eee4ca9b7fd950164a577a88a82c5ce8c4bc74223d1a637651876758dc1dc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=what+is+the+book+a+bad+case+of+stripes+about PDF link annotation
    • https://cdn.sqhk.co/nuroteditu/488mlBx/castaway_bay_arcade_hours.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459922/normal_5ffd6673e801d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472506/normal_5fcf021b0742b.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/7hhPrjg/retasaremaserazuresu.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/igiajaY/adderall_xr_dose_range.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/ObFWhbW/54437601990.pdfIn PDF document text
    • http://itanto.space/qmp_board_army8zaex.pdfIn PDF document text
    • http://okclub.org/sony_a77ii_owners_manual2mcbt.pdfIn PDF document text
    • http://fb-ig-violation.com/97764622149d8ypi.pdfIn PDF document text
    • http://it50discount.pro/pizuzupilimibenz5zr0.pdfIn PDF document text
    • https://cdn.sqhk.co/mujutuzidip/jgdhdgg/how_to_perform_reverse_barbeau_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415929/normal_5fd712192e194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_8614062e258144ef928e38e4bdab4ea7.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_1bba759845de47a79ddf20aa264612a1.pdf?index=trueIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_853dcb104df049479a6768dc908dd91f.pdf?index=trueIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_ccd44f9f0e6e45579ac467a844640c33.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_30100e224c354fef96a5a49ba3a47f4c.pdf?index=trueIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_949cf58022234610a34ba7c2e69f164a.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_b632c78c6a074bafb59a4c25e1e25e8b.pdf?index=trueIn 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_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 5428 bytes
SHA-256: 0b773c7d41f438d142058ab07da3b5cce34bb78329fd9fc6a2aa4f9425fd755d
font_01_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 10708 bytes
SHA-256: 44ba7de7cea3a3ea1696cea925c3d1742b763acdd8342f2aa9e3d6fc28b4c490

Open this report in the interactive analyzer, or submit your own file for analysis.