Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57e3e81ffb40529…

MALICIOUS

PDF

79.6 KB Created: 2021-02-22 22:21:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0d9a44c8b7f65e3b8cef1137f68fff21 SHA-1: 8fbf612bf91aa7fae90025c774d61f4bcf4cae82 SHA-256: e57e3e81ffb40529535e6334e49b78af5275155b9775b698ac547eeb4fd4b8c7
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of embedded links pointing to various domains, many of which are flagged as malicious or disposable hosting. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that the document is designed to redirect users to potentially harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this file.

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
  • 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/123?utm_term=poem+of+the+man+god+volume+3 In PDF document text
    • https://xufefizomuziz.weebly.com/uploads/1/3/5/3/135346589/3824836.pdfIn PDF document text
    • http://amst-watch-v1.club/bodovelusejosowutuko8uq0.pdfIn PDF document text
    • http://yoga-italy.space/mosavizomibjhl9.pdfIn PDF document text
    • https://lufigukinuma.weebly.com/uploads/1/3/2/6/132680864/f4d75.pdfIn PDF document text
    • http://gozatelaji.22web.org/hydromatic_guide_rail_system.pdfIn PDF document text
    • http://vseti.life/35536539314bcwgt.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/english_speaking_notes_in_marathi83hlk.pdfIn PDF document text
    • https://fizegebukuri.weebly.com/uploads/1/3/1/4/131453213/rokibi-jikigukaforuz-tiresele-wobaxezakigeb.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/2809442.pdfIn PDF document text
    • http://italysummer.space/cities_skylines_industries_guide_oiln3urg.pdfIn PDF document text
    • https://fewegako.weebly.com/uploads/1/3/1/4/131453302/wademumovubifetoli.pdfIn PDF document text
    • http://unityfree.xyz/time_traveler_roller_coaster_off_ridema8bk.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/soberilemino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xetumerim.rf.gd/88281779232.pdfIn PDF document text
    • http://rilifufamorupud.epizy.com/84540191476.pdfIn PDF document text
    • http://pisisagul.epizy.com/cabin_fever_movie_in_tamilyogi.pdfIn PDF document text
    • http://mimodiko.epizy.com/monster_incidents_anime_characters.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 5104 bytes
SHA-256: e9e0f124c1692166f8cb80add88b9231547f2a1347d3f5ac23c21480fe1f543a
font_01_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 10708 bytes
SHA-256: ad5eceb5420ad5d46c682f39690fd7996fd7e80c13f5be3502c64ac759087a44
font_02_sfnt_off00012334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12334 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3