Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0637cf3d743573…

MALICIOUS

PDF

88.3 KB Created: 2021-03-26 08:01:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 908327663a06d564da47c62f33f6e6c6 SHA-1: 18276d30e4d8ebe7560238f54ce2c2b6cbc1ed74 SHA-256: ed0637cf3d743573376cfada50f39bababa63b8a920b5a0b625d1bdae63a1768
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services or appear to be part of a link farm, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or malicious PDF. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=ccna+voice+study+guide+pdf
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/6785471.pdf
    • https://wuneregogituweg.weebly.com/uploads/1/3/4/6/134686440/pejenuni_sunip_rosipopipo_dubejokura.pdf
    • https://pesuzipowezav.weebly.com/uploads/1/3/1/6/131636843/nenelamowube.pdf
    • http://tramlaweq.online/different_types_of_pipe_fittingsysd94.pdf
    • https://static.s123-cdn-static.com/uploads/4445731/normal_600618622cef3.pdf
    • https://cdn-cms.f-static.net/uploads/4455196/normal_604dd4b9a9676.pdf
    • http://hookup157.online/29193762241jwo1i.pdf
    • https://guretaximijogu.weebly.com/uploads/1/3/0/7/130739376/3abf8e647deae.pdf
    • http://avtoshkola-region26.ru/zoo_tycoon_xbox_one_breeding_guidebztv3.pdf
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/lisatexefasupe.pdf
    • http://sallehub.xyz/is_the_capitalized_before_universityaloti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/donarepemi/how_many_questions_are_on_the_north_carolina_notary_exam.pdf
    • https://uploads.strikinglycdn.com/files/366d8027-7967-47bf-af75-6370d0d4c756/28373559666.pdf
    • https://uploads.strikinglycdn.com/files/013dd1ae-84f5-4286-ba38-1c8bc0ed92ae/fesisisofetimajurexudawi.pdf
    • https://uploads.strikinglycdn.com/files/6a5f04cf-cde7-4647-9ddc-bf2e00245028/desixogowabupo.pdf
    • https://uploads.strikinglycdn.com/files/80b62be5-a12c-437f-abe9-cb512dc74fdb/formato_de_tesis_de_licenciatura_unam.pdf
    • https://uploads.strikinglycdn.com/files/45797fee-a52d-473c-bbf0-2ded4b0f719c/we_yevgeny_zamyatin_characters.pdf
    • https://uploads.strikinglycdn.com/files/a827bc94-f2b8-4bd6-bf03-46b7af925aab/can_you_replace_the_earpads_on_beats_studio.pdf
    • https://s3.amazonaws.com/tikoweravisixu/93378807750.pdf
    • https://uploads.strikinglycdn.com/files/8e09d53c-c9c9-45b3-9c2a-afedfbca882e/nissan_frontier_repair_forum.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a94.bin
694bacc3e472f1d0bd25067659cd9e6e0704c9ad67d60375f6606c6634efada8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 5264 bytes
font_01_sfnt_off00012ca6.bin
12b5124c52250f02d8eaa44a0a7736b51bafea33b555d67ad05dff736fb7d346		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA6 11208 bytes

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