Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a3a5b64ea283ea…

MALICIOUS

PDF

105.2 KB Created: 2021-01-29 11:14:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 38fa060a12b403c3dc59c427a040e082 SHA-1: e0b8af4f0e8854d3701f3f88ca9f388fa069f9ab SHA-256: c6a3a5b64ea283eae7fbe9da3a556a8ca7e125794324979a991e6deb460bcc0a
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to redirect users to external sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/aws?utm_term=nfl+schedule+2019+week+1+pdf PDF link annotation
    • https://cdn.sqhk.co/tikalijit/OlWgjif/voice_changer_celebrity_voice_box_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/towitudamuga/hjfFif1/78086563102.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/gGt3q92/47228887810.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413850/normal_5fffa472c6d91.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/YN2KwhX/zombie_3d_gun_shooter_unlimited_money_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/HTGK8ge/suzulumuwabagenawe.pdfIn PDF document text
    • https://jinokafolamod.weebly.com/uploads/1/3/4/3/134310646/jojajasimapo.pdfIn PDF document text
    • https://cdn.sqhk.co/zowesifona/icEiiBt/small_business_start_up_costs_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447437/normal_5fcbab0fc8912.pdfIn PDF document text
    • https://sijivijotulexe.weebly.com/uploads/1/3/1/1/131164009/vetoxirudijuruxoruw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevegure.rf.gd/pukerunopem.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/financial_statement_excel_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/amman_songs_free_tamilwire.pdfIn PDF document text
    • http://losuguv.epizy.com/zabokuxalepusasupel.pdfIn PDF document text
    • http://mujelolix.epizy.com/dainik_jagran_epaper_lucknow.pdfIn PDF document text
    • http://pezedavepajizum.rf.gd/22553095445.pdfIn PDF document text
    • http://tamuluworab.rf.gd/51902122337.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/nobenajovis.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_off00015b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B2E 5544 bytes
SHA-256: 66659c7a30e3da583792dd244c5fb0fc62cde9b82e1b087f18ba298b787fcb7c
font_01_sfnt_off00016e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E33 12364 bytes
SHA-256: 22fac40cf2bae7d3a57c2aeb28212379bc8422d0ec9419e0ed977ef405d05828

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