Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3da5cefd5b9bc5…

MALICIOUS

PDF

97.1 KB Created: 2021-03-20 22:33:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1e70ccb1b9e24d8aa25e508f5e504ced SHA-1: d198116a791d8098bff6a172036855b5f3318f78 SHA-256: bb3da5cefd5b9bc5d92505618f86d9aea8f9d4ca8b8a37dc4da4196633fadbb6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' and the presence of a URL with a 'complete abortion ultrasound report' query parameter strongly indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to lead users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/123?utm_term=complete+abortion+ultrasound+report PDF link annotation
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/kufogep-walozagam-pefaxoxesujoj-zozosa.pdfIn PDF document text
    • http://zekabor.iblogger.org/premiere_pro_freezing_during_render.pdfIn PDF document text
    • https://binezorimitujux.weebly.com/uploads/1/3/4/3/134337637/sotezupujifa_xiteto_jidetet.pdfIn PDF document text
    • https://befejabenitegi.weebly.com/uploads/1/3/4/5/134530095/8000710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_6038fc5f1baaf.pdfIn PDF document text
    • https://cdn.sqhk.co/nirobipodev/ijaijjj/anatomical_terminology_relative_position_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_602f25d6920f9.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/Ejdhjjc/american_off_road_extreme_racer.pdfIn PDF document text
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/ec35a8.pdfIn PDF document text
    • https://nupanirosum.weebly.com/uploads/1/3/4/8/134858368/0a28fe.pdfIn PDF document text
    • https://komipakokituk.weebly.com/uploads/1/3/5/9/135993761/deloramasuk.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/hbLd8ii/58536476431.pdfIn PDF document text
    • https://kabukarolezero.weebly.com/uploads/1/3/1/0/131070374/8321337.pdfIn PDF document text
    • https://tijisifexabid.weebly.com/uploads/1/3/1/0/131070771/fadabirusov_jekuligo_vevelu.pdfIn PDF document text
    • https://juliraviwuziw.weebly.com/uploads/1/3/4/2/134267057/4d1c0f5b7082be1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_600d88a9f189b.pdfIn PDF document text
    • https://pejapuvurexoku.weebly.com/uploads/1/3/1/6/131636728/0c50e2bd82d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_3bacac42b36b44028d9ba461096c3508.pdf?index=trueIn PDF document text
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_1d885e8fb81a418ea69a0d740c6123c8.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_c5dd33e94c934e738dae75c3b3663195.pdf?index=trueIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_fdd1dac1f6454d59b4a56e91ea85df20.pdf?index=trueIn PDF document text
    • http://bikoran.rf.gd/31426579017.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001271b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271B 5148 bytes
SHA-256: 45398755a91c22b7832f1b2ce17b763cef6731aab840a56d4b6df56ce449b402
font_01_sfnt_off00013873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13873 11932 bytes
SHA-256: 0a4bde759c34013ae260603219566ff3a75caa386fba9240f1730164ba2a64dd
font_02_sfnt_off00016188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16188 16060 bytes
SHA-256: 503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6

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