Malicious PDF — malware analysis report

Static analysis result for SHA-256 5896c50f8f4926b5…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 22:38:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d7930dfcaf7b71e18e3fc0868decc4a8 SHA-1: d373fa8af7bfc3785c9b761930098fc6b2c9ae82 SHA-256: 5896c50f8f4926b5328090b6b3f30f2cf70d56e178f039d9803978e8cd86121e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable or suspicious domains, indicating a link farm or SEO manipulation tactic. Heuristics and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves luring users to external malicious content via embedded links.

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://baarspo.ru/aws?utm_term=dark+souls+3+endings PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407302/normal_5fe456bb5975c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454543/normal_6002c53cefa13.pdfIn PDF document text
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/kufageluz.pdfIn PDF document text
    • http://mavixepajifulem.scienceontheweb.net/jizaxusutukutibarino.pdfIn PDF document text
    • http://myfoxing.online/tuderizejojefozirevefovubbm9y9.pdfIn PDF document text
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/desazizis.pdfIn PDF document text
    • https://vobisikokupitux.weebly.com/uploads/1/3/5/3/135348895/2e2d51a779a1.pdfIn PDF document text
    • https://fokakumunimu.weebly.com/uploads/1/3/4/2/134266115/2ba2e9590.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/jim_croce_guitar_songbook.pdfIn PDF document text
    • http://figejewumoposes.getenjoyment.net/letojuxopawerotiwoxame.pdfIn PDF document text
    • http://komarovskii.xyz/36428806073fsxi2.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/ccbbcfe6-ebdb-467c-9db9-478b5f5dc1af/madolelusogukadinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a059b7-38de-4755-8861-ae9dd6a06696/81369399926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f718bad-b300-47b0-bee3-3d4f249740a8/serilibeset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e75881e3-b164-4b6e-b534-7b5e2c12d897/blood_angels_codex_supplement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33407e65-5aca-4cbf-83d7-72934b2f9b23/how_to_remove_light_fixture_from_hampton_bay_ceiling_fan.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_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 5220 bytes
SHA-256: 65ad655877c338dee869339958d65e03b54693478f3b9ff95561709f38f21ec1
font_01_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 10524 bytes
SHA-256: f6eb25bd1b730ffb8f4a08e659029938b9f224dcb86a918fdc39d10e0bd92144

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