Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f3bc0107ec3e95…

MALICIOUS

PDF

81.2 KB Created: 2021-03-20 21:37:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6b65d284316b043601ab946e05a8e8ca SHA-1: d4c9e9c1d5077251c88db1568109382f446d3939 SHA-256: 21f3bc0107ec3e954a0dcb14901687a8fbf094717c5d39cc2bc8bcc94a5e12ee
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to suspicious or disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The ClamAV detection further supports its classification as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crophysi.ru/strik?utm_term=digitech+vocalist+live+fx+vlfx In PDF document text
    • http://tricitysikhs.com/2013_jeep_grand_cherokee_overland_headlight_replacementkjebb.pdfIn PDF document text
    • http://zitarekatinupas.sportsontheweb.net/rudoxozanezugitonuki.pdfIn PDF document text
    • https://cdn.sqhk.co/jilazelitor/jge6aii/hotstar_app_free_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/idhhUPn/v8_car_traffic_racer_game.pdfIn PDF document text
    • http://baltika-trans.com/wenatulg0eu.pdfIn PDF document text
    • https://zivejopoji.weebly.com/uploads/1/3/4/2/134266783/lozibewo.pdfIn PDF document text
    • http://yildirimotobursa.com/xinamiwupexuwapemexujivolvd26c.pdfIn PDF document text
    • http://rotixumuzu.22web.org/tubijef.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwalimo/f3IIheF/72399697945.pdfIn PDF document text
    • http://fepenikozi.22web.org/new_marlin_336c_review.pdfIn PDF document text
    • http://ziwegiwe.iblogger.org/dryer_sheets_mice_rv.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/icChegd/kibafod.pdfIn PDF document text
    • https://fusewexe.weebly.com/uploads/1/3/2/7/132712136/4ed09f91.pdfIn PDF document text
    • https://sagagedonu.weebly.com/uploads/1/3/4/0/134017332/soxutimasofo.pdfIn PDF document text
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/luzefu_lowot_lorijerebe_jumizazixodu.pdfIn PDF document text
    • http://effektzhizni.ru/vulunal3if8.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/a7c3dc52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_8b703fe64c6f4f4e9471edde00e5c294.pdf?index=trueIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_c2faddf0b5954f87ac011b54488cff41.pdf?index=trueIn PDF document text
    • http://kiladogovato.rf.gd/why_does_my_hp_photosmart_5520_not_printing_black.pdfIn PDF document text
    • http://gejujebiwibi.epizy.com/68995258976.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_06aaf17a61c84c86adacc465d5304f58.pdf?index=trueIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_f6b851f670124983a20e6784d53c74fa.pdf?index=trueIn PDF document text
    • http://vovojoj.atwebpages.com/jurnal_animisme.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_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 5172 bytes
SHA-256: 6dc9a1415658d9648fc48d100d8d9c088dfb9b0a99fb47f72a3ded2313957055
font_01_sfnt_off00011001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11001 11032 bytes
SHA-256: 12ee597eab382a72104a6742937cef77b20f8ed2c4fe6b9f0b5b7442d2c7c744

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