Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5693fea992c4f9f…

MALICIOUS

PDF

94.2 KB Created: 2021-03-09 05:03:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d1babdb57ba2462ddba8f9bf3e9f21a6 SHA-1: d4751d6be8e30ae891b29b94c11cf6c834e6371a SHA-256: f5693fea992c4f9f0174b4f33bd4b62a6a7c1bae290939c9061b997dd369f3b1
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high ML score. It functions as a link farm, containing numerous embedded URLs pointing to various domains, likely for SEO manipulation or phishing purposes. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=ups+apc+10+kva+pdf In PDF document text
    • https://cdn.sqhk.co/luzigagoguna/ivY0chc/world_war_z_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/gcjhemQ/68679352229.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/ic9ghxV/evil_horror_monster_2.pdfIn PDF document text
    • https://fomimixa.weebly.com/uploads/1/3/4/7/134775862/9d71e6e838dd72a.pdfIn PDF document text
    • http://xaxipulivu.22web.org/nexoviperijuw.pdfIn PDF document text
    • http://vofikupubuxebop.iblogger.org/39953228918.pdfIn PDF document text
    • https://powotatetodo.weebly.com/uploads/1/3/0/7/130738650/rades-wuxir-kanojis.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/Iuicyhh/coin_collection_album_flipkart.pdfIn PDF document text
    • http://tabekam.22web.org/abrasive_form_illinois.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/e1d241a8-db99-45be-86e4-b27fa282e9dc/81879779573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa27ccd-d2e9-4970-8e2c-e5d1a3869666/night_sky_map_app_free.pdfIn PDF document text
    • http://nanesipub.rf.gd/lanaxavolujatikud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1841f96f-2363-4920-bdf0-74708aaa5950/panasonic_plasma_tv_wont_turn_on.pdfIn PDF document text
    • http://wekolaxoretewov.epizy.com/jaminesi.pdfIn PDF document text
    • http://pavuwovoj.rf.gd/yaesu_ft_8800r_separation_kit.pdfIn PDF document text
    • http://merixokove.rf.gd/83540272985.pdfIn PDF document text
    • http://kubumoran.rf.gd/savowuxufa.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
    • 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_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 5332 bytes
SHA-256: 7e60ceac2da2c19923ac0b583df47eaeada0bf8909b202a066b0e0702b334a7b
font_01_sfnt_off0001248c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248C 16084 bytes
SHA-256: 081f4e84ebc09d236d58ef23b5b73a2675831492127d15c444e93b1d2b4049cc
font_02_sfnt_off0001567f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567F 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1

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