Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f12cbc1a7dbdf81…

MALICIOUS

PDF

110.3 KB Created: 2021-06-02 18:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 638e0dd89fc82682e2c48a5840b6ab91 SHA-1: 267121546ba3226a1a0f18d7a50d67519f01852c SHA-256: 5f12cbc1a7dbdf81f2ed1741412c806b9247d554d6689ed81eeaeeee9d3ee5e9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous URLs point towards a phishing or content-luring attack pattern.

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
  • 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://drafthe.ru/pbw?utm_term=carcassonne+amazonas+rules+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489237/normal_60369c1ba26da.pdfIn PDF document text
    • https://wafumaxa.weebly.com/uploads/1/3/5/4/135400811/4c15287c33ebf02.pdfIn PDF document text
    • https://fomomeku.weebly.com/uploads/1/3/2/7/132712435/73a0711264c681.pdfIn PDF document text
    • https://pigabatanez.weebly.com/uploads/1/3/1/3/131380253/6691e0c996ca22.pdfIn PDF document text
    • https://rojanudase.weebly.com/uploads/1/3/0/9/130969060/6808782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482869/normal_6061cb39b7a64.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/jijenepuvoni-redupu-kofepugudijude.pdfIn PDF document text
    • https://rilitovewub.weebly.com/uploads/1/3/4/0/134095842/wisokululixivug.pdfIn PDF document text
    • https://nakubinigana.weebly.com/uploads/1/3/1/3/131379761/xerigezuramavaguf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487399/normal_5fe181366fbac.pdfIn PDF document text
    • https://medekegiloninev.weebly.com/uploads/1/3/4/7/134716174/8230546.pdfIn PDF document text
    • https://kamobukumigudeg.weebly.com/uploads/1/3/1/0/131069934/8688232.pdfIn PDF document text
    • https://derakudo.weebly.com/uploads/1/3/4/2/134266069/verezixa.pdfIn PDF document text
    • https://felomadexibeb.weebly.com/uploads/1/3/4/6/134687620/35d72bec863754.pdfIn PDF document text
    • https://jozudepixivi.weebly.com/uploads/1/3/4/6/134682498/5560194.pdfIn PDF document text
    • https://xomepuwosabagef.weebly.com/uploads/1/3/0/9/130969083/dexis_xirumageli_lusekev_gixopofow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366405/normal_5fe54b7c471ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_603981a62c7b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144449802/how_to_have_intimacy_with_the_holy_spirit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc619d16-fcee-4fe8-9b77-312974adb54d/the_secret_history_of_the_mongols_english_translation.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/mokabotinamevenowalilap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b58fad-594b-48dd-a564-6ab429862286/how_to_calculate_voltage_drop_in_series_circuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e2ed8f-9776-40c4-86fb-1383598d1ef4/anet_a6_printable_upgrades.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/f/how_to_find_my_saved_passwords_on_android.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_off00016d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D98 5256 bytes
SHA-256: d0393b9b370e77d9601454829373425da680c00396a759cb6f8f487fff23fa7d
font_01_sfnt_off00017f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F66 14128 bytes
SHA-256: 5e7580cd5de98dd7a0c0fcd06e63092fc49bc902d66d92549f26e55bf9e5f5e1