Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a516f6f4db41b80…

MALICIOUS

PDF

79.1 KB Created: 2021-03-14 16:03:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 284835088ded4c7bd7dabed2da9c43b1 SHA-1: e64e552536e97767823b2a4eefd4251eff15b294 SHA-256: 3a516f6f4db41b80bb0b75e1e5d3b3381dcbadb7585f3fc69a7eabf3ee9a1734
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to distribute malicious content or redirect users. The primary malicious URL identified is dugedepap.ru, which is likely used to serve a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://dugedepap.ru/strik?utm_term=soccer+drills+to+do+at+home+by+yourself PDF link annotation
    • https://dakijixubuleze.weebly.com/uploads/1/3/0/7/130740496/wupumenagifoxo.pdfIn PDF document text
    • https://sekotujuf.weebly.com/uploads/1/3/5/9/135960234/janodizinekasek.pdfIn PDF document text
    • https://pafegesufo.weebly.com/uploads/1/3/4/7/134719460/4700507.pdfIn PDF document text
    • https://gorogonib.weebly.com/uploads/1/3/0/7/130775466/5866152.pdfIn PDF document text
    • https://kivuvuvilex.weebly.com/uploads/1/3/2/7/132741385/5662857.pdfIn PDF document text
    • https://renixopofofof.weebly.com/uploads/1/3/4/4/134486295/wotulonuminajesuba.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/jgjygi4/41640000691.pdfIn PDF document text
    • https://xoxovumalojiru.weebly.com/uploads/1/3/0/8/130874224/roloxazoj-kakigogux-guxad-jofujedisori.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/agdjbgf/your_guide_careers.pdfIn PDF document text
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/fabiwutoxosife.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/gapiroluwijavexek.pdfIn PDF document text
    • https://cdn.sqhk.co/rirakibugo/japgd1c/8761002598.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/duwuzedek_tisaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitirew/kiloduxuronamipinej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b06e30-1411-4d12-b3e3-aa8b4008e99c/66162808201.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_6dc09d24e3884f7a8aa946bd21faee27.pdf?index=trueIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_eb5807b42c9240fab22a6ada5085c3a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d354a5-0971-4f03-a5b3-db06f8aef292/sogalupodanutijip.pdfIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_a4d806f9b9e140ebbff107cf0f0c8b9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d8e275-0998-416a-9011-9a9b06edd88d/hp_pavilion_dv6000_audio_drivers_for_windows_7_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/mean_median_mode_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a54b5ea1-6277-4373-ba24-c99406a516ea/marvel_movies_and_series_in_chronological_order_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c40b24-158f-4750-bf09-763efd73db70/energy_kinetics_system_2000_manual.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_0e1f44495e7c4dec8e42cc9608c03e59.pdf?index=trueIn PDF document text
    • https://dcd55a6f-f4d9-4ab7-9ea0-0dac4ffa5d6f.filesusr.com/ugd/f7cbe4_7011cdf5c0e84a6293f0031f5de8db66.pdf?index=trueIn 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_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 5604 bytes
SHA-256: bf7a90a583a5acdc525bea7cab5c24645d732115a1ad26b486d63e7559a48328
font_01_sfnt_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 10648 bytes
SHA-256: f2ea1bf29d2aad03bd2a8bd608e0dd56f1f632c6b915d931298a2009d63b564c

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