Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab419477d633f86…

MALICIOUS

PDF

77.5 KB Created: 2021-03-11 13:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e28ae5805f41a826d2930699539e4bb SHA-1: 5fcf376574c7add27e9ce5b2283ab807bc7207ba SHA-256: 2ab419477d633f864027a691a0d22d90af5478a34a97964d9461cb5054f0ddd2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://resalured.ru/award?keyword=algebra+2+common+core+textbook+pdf+pearson PDF link annotation
    • https://cdn.sqhk.co/jubawiwa/jiidgcN/91995765030.pdfIn PDF document text
    • http://gudokevuxowa.22web.org/businessman_telugu_full_movie_3gp_free.pdfIn PDF document text
    • https://papukelub.weebly.com/uploads/1/3/4/6/134666119/pufolakoki.pdfIn PDF document text
    • http://superheatbelt.xyz/how_much_do_refrigeration_technicians_make_a_yearfeot0.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/54ceb4566a38.pdfIn PDF document text
    • http://igcopyrightforhelps.com/831893763193sj8w.pdfIn PDF document text
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/lazabukodudado-kobozakom-turilevex.pdfIn PDF document text
    • https://cdn.sqhk.co/nudogada/iaXEQHs/paralyzed_veterans_of_america_washington_dc_phone_number.pdfIn PDF document text
    • https://pimitasemoz.weebly.com/uploads/1/3/4/6/134646318/7762853.pdfIn PDF document text
    • http://liketime.online/68632759986rt85d.pdfIn PDF document text
    • https://cdn.sqhk.co/ripowusaro/jbRij22/tutovarele.pdfIn PDF document text
    • http://sarhello.online/cardboard_connection_2020_topps4wb8d.pdfIn PDF document text
    • https://cdn.sqhk.co/xiruregexibe/caetgjS/tokaido_collector_s_edition_vs_deluxe.pdfIn PDF document text
    • https://woruranevulabiw.weebly.com/uploads/1/3/4/0/134096732/4353768.pdfIn PDF document text
    • https://mapobosani.weebly.com/uploads/1/3/4/3/134385232/d8b7bdcb.pdfIn PDF document text
    • https://xupufofi.weebly.com/uploads/1/3/4/7/134766196/fe77afa2aa66.pdfIn PDF document text
    • https://natitapa.weebly.com/uploads/1/3/1/3/131379406/6530800.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawibejib.epizy.com/nuclear_chemistry_review_guide_answers.pdfIn PDF document text
    • http://rubedaragijurof.rf.gd/sony_str_dh790_7.2_review.pdfIn PDF document text
    • http://tepimajasajuk.epizy.com/the_cars_greatest_hits.pdfIn PDF document text
    • http://nasuxenabo.epizy.com/icloud_activation_bypass_software_free.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_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 5868 bytes
SHA-256: 84a30d013e7bfa74c8f9ee21870d96f2128e43b0e89b1a470a0f8f764fb62f32
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 10444 bytes
SHA-256: 71b0bcedeb222e7edacfa68ccdfd49831c8d9877ebf867c1554c85c6b0f98917