Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a953656860d932…

MALICIOUS

PDF

85.4 KB Created: 2021-02-27 22:21:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a34beddf0469b6c92d71c7b2c49dc715 SHA-1: f7818791a55e1f64a288811e9c31f79b2d7f240a SHA-256: 66a953656860d9321bb8f9e421fe4eb310701cf396ea236006416da96a548128
146 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and a callback phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of external URIs and the callback lure pattern point towards a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/aws?utm_term=how+much+does+a+criminal+defense+lawyer+cost PDF link annotation
    • http://csxmoney.info/suxijojasype0.pdfIn PDF document text
    • http://eliyalte.com/2231296731025r4x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453142/normal_5fe0ced2029c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481402/normal_5fe24d335d8c3.pdfIn PDF document text
    • https://cdn.sqhk.co/worenora/ZGggJio/90028503861.pdfIn PDF document text
    • https://cdn.sqhk.co/bawevabob/jggdjbD/jodogaselujafor.pdfIn PDF document text
    • http://autokenn.com/weather_report_for_charles_town_wv0u6xk.pdfIn PDF document text
    • https://cdn.sqhk.co/pomisiforuko/ejeVjdL/sugavunafatomo.pdfIn PDF document text
    • http://hydra.moscow/51031441857zdg6y.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/5783953507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388617/normal_6001d38292868.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/how_to_reset_casio_solar_watch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374518/normal_5ff679bde4085.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/bKrbiYg/dabasax.pdfIn PDF document text
    • http://spencermcman.us/262776614432inqf.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/21094522629.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
    • https://s3.amazonaws.com/sukobogixe/football_manager_2018_pc_ita.pdfIn PDF document text
    • http://xutulatovemi.epizy.com/free_biology_notes_form_3.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/16183186877.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/77517322397.pdfIn PDF document text
    • http://jopasimu.rf.gd/fenosali.pdfIn PDF document text
    • http://boxogegifenefi.epizy.com/common_core_math_worksheets_8th_grade.pdfIn PDF document text
    • http://zavukazena.epizy.com/fefosunabozapebu.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_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 5300 bytes
SHA-256: 49723c8026e827c5b9d468a0371d4c5d06d85f0b8258ec6da847df1f32ab473d
font_01_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 12000 bytes
SHA-256: f5376664d491c41cbcba907dcee4e22b22c1237993c2a0de2e95359cb4d2b27e
font_02_sfnt_off00013958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13958 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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