Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b469ad2ac74e97e…

MALICIOUS

PDF

129.9 KB Created: 2021-05-28 11:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2cb3a94ac932371419f8de83da5f4525 SHA-1: 26d5a04274fbe3795dce855e71a1a93790a7b1c6 SHA-256: 9b469ad2ac74e97e13bcced29d658c212f3f4c4b6a63d6d39f2788f11f7fa0b3
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/123?utm_term=behavior+modification+techniques+in+the+classroom+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369522/normal_6014677740a0e.pdfIn PDF document text
    • https://menuvudojowakap.weebly.com/uploads/1/3/4/5/134594867/5735831.pdfIn PDF document text
    • https://wegejazibeb.weebly.com/uploads/1/3/5/3/135305894/nazanur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_6032c6f4571eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477655/normal_5feed7eddb9a5.pdfIn PDF document text
    • https://levukuwaxumofet.weebly.com/uploads/1/3/1/3/131383949/7c08c0686bbc.pdfIn PDF document text
    • https://suxokigivulumu.weebly.com/uploads/1/3/4/4/134479742/tozava.pdfIn PDF document text
    • https://vabuxijipureg.weebly.com/uploads/1/3/4/4/134476882/bilexowizi.pdfIn PDF document text
    • https://zuxusesomopekem.weebly.com/uploads/1/3/5/3/135305840/7020699.pdfIn PDF document text
    • https://pabazoba.weebly.com/uploads/1/3/1/3/131381204/risifabutuliwo_vanidaruvalod_kunejava_bupupe.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://uploads.strikinglycdn.com/files/2276f42e-0fa4-435d-af87-bbc903bdc4cd/western_union_money_transfer_from_philippines_to_singapore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4216520-4b33-469c-8ded-5a069bd32c36/what_years_did_they_make_the_polaris_trail_boss_325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ccd04b-e606-446b-842c-04a53d7e2e0b/1996_chevy_blazer_engine_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df16c401-cb44-4f07-ba40-36e325b688ac/lugapuwosifis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d87a332-a1e2-4282-a732-bae5436cd88f/24806784451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0be39d1-dc6e-4bd6-8127-3cd57fa48ba1/3790514660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b2ccfd-c165-430e-93ab-b78900b92d2b/ruzatewuxezatidakisabida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba47237-217f-4c9a-9bde-bbfac361ef28/79470321314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6022ea-a1e6-4156-b5ee-1fd606221cf1/ck-100_v99_car_key_programmer_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0ed96d-c444-4c97-aeae-44f94bb7021b/45535765533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f0b854f-1a9d-41d1-ba90-9f15db9186e8/53207967012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc75592f-0767-4b06-bbd1-49618fd2a74d/kidifilegogupokemus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0962585f-9b57-48a3-9a22-a5ca41e43f16/45084800032.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_off0001b32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B32D 5512 bytes
SHA-256: cf4da1b879a2d30399c416906564498e92c01763c25e8d8ede4b09ce2fa10f61
font_01_sfnt_off0001c5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5C8 10884 bytes
SHA-256: 226634c972c9a830c9bd68c4096754646e28747840b3f51068762597b96cee79
font_02_sfnt_off0001eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB0A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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