Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ca17bf33654173…

MALICIOUS

PDF

82.1 KB Created: 2021-04-23 10:40:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f3726d3356d8aae5ed96afb2b95dded1 SHA-1: e87af9379ac536491d6a93226169bebbbbe6b0f3 SHA-256: c9ca17bf336541730777abee7145ded15863b1a0c4b249a03a458ba6c8ec3f10
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirectors, indicating a link farm designed to distribute malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly suggest this malicious intent. The presence of a callback lure heuristic also points towards phishing or scamming activities. While no scripts were explicitly extracted, the nature of the PDF and its links suggest it's likely a delivery mechanism for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+do+market+analysis+for+stocks In PDF document text
    • https://felabare.weebly.com/uploads/1/3/0/7/130776415/9292393.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/bicqa8L/english_stories_to_read.pdfIn PDF document text
    • http://dozisozaxup.22web.org/88753567963.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/5hghdjh/54512116482.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/hEje28W/netodixujejupimiza.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/hceW1qK/hot_deals_hotels_in_lebanon.pdfIn PDF document text
    • https://cdn.sqhk.co/nazalugewu/fZjhpJR/43464668815.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/WYgiibV/87354448804.pdfIn PDF document text
    • https://vajojesorenum.weebly.com/uploads/1/3/0/9/130969616/vepedamudugaz-vefugejoke.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/fWhhhfO/91687756340.pdfIn PDF document text
    • https://cdn.sqhk.co/lofujumixas/WNgiIhi/21123389143.pdfIn PDF document text
    • https://togutugu.weebly.com/uploads/1/3/4/6/134617883/tolipidewow.pdfIn PDF document text
    • https://cdn.sqhk.co/ramowejub/gdGWhau/world_war_2_military_history_books.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/helniwA/bow_shooting_games_app.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/bggegg7/cars_for_sale_mn_under_6000.pdfIn PDF document text
    • https://cdn.sqhk.co/rezejigobip/jghghae/zombie_diary_2_hack_mod_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bowupezik.epizy.com/mandolin_scales_and_arpeggios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a50244-1c65-4cc7-ab7a-2d59e1680079/cos_180_-_theta_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/190e9fef-d858-4ef2-b83d-14a7814747fd/what_are_some_diagnostic_tests.pdfIn PDF document text
    • http://tumawom.epizy.com/shure_ulxd4_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4606e075-dca6-4fb9-9fc3-3d2cc3a7a26e/how_much_does_a_2000_coleman_pop_up_camper_weight.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_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 5384 bytes
SHA-256: 368206430797e2f4b33f3818a12ca77bd001190959c4c1e6682c6851db18db39
font_01_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 11428 bytes
SHA-256: c15b5ee13c083277d9c5cab51b0c0f536c91d035db468c68487f4ec7b99d7321

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