Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87b580987965707…

MALICIOUS

PDF

80.4 KB Created: 2021-04-06 01:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e4d95ea93165a9b5ae8032f4eaec449f SHA-1: f711f74d74252d0303fec7fe1a454aae9e15b1e9 SHA-256: c87b5809879657072421b86b693fd38a4fb30bdc27a134961488aa0efcd4a5b9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=dho+health+science+chapter+7+pdf PDF link annotation
    • https://cdn.sqhk.co/mibaforetu/hbjeXyX/67695726842.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/cgdIgiL/lego_legacy_heroes_unboxed_characters_list.pdfIn PDF document text
    • http://dizofuses.mypressonline.com/aprender_ingls_sozinho_livro.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/accountancy_project_for_class_12_cbse_2020_18_download.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://5de6e22f-064f-4859-b003-4eaa502c5056.filesusr.com/ugd/2609e6_7c2cffb3e2df48bdb648e64dd33bd0a3.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_7c51779802d64b788bdfbe2e216e0abc.pdf?index=trueIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_e57a55ede45c4666bc023bf43d821cc5.pdf?index=trueIn PDF document text
    • http://wumafopid.onlinewebshop.net/acknowledgement_for_college_project.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_37f6340543fa4f2b9ae6c759abd470a9.pdf?index=trueIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_ba1129aa13ed4630854a96dc2cd1f014.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3deb2e36-ffa2-41e5-b797-b6f966b84aeb/baluvon.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_01c1f20ee5b743a4a71f5e96f717e4c2.pdf?index=trueIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_de39e585bd4f4c36a42408ce13e27893.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/083c3aa8-483f-4865-a549-d9f1fe0df4a8/futegife.pdfIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_6dc14a75035142bcb5a8243bab1c0cf6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2ca578e-1bc7-4c99-b020-ad591698a22c/48751603620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c784636d-0cf4-4b9f-9561-ad3d7cfcac44/30781881432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f5bb02-b338-4f05-9e69-cc91abbc1005/rexalaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b0ba69-43dc-4b58-acf5-d7112acd980c/maridisokaxaded.pdfIn PDF document text
    • https://73ea35ec-f0b0-4773-8bcb-d62b778c7de8.filesusr.com/ugd/a8e976_ea11d77e79d048e991955bd2c45cd49e.pdf?index=trueIn PDF document text
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_818d00f862424016963ccbdcb6fdfcd8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 5112 bytes
SHA-256: 680be478c1b01ec110af84ea8a57e0342b759ad246d23523a96c4e5d7e1990d8
font_01_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 11336 bytes
SHA-256: b0cc47041c576e866c140a3eb00f287e237917a354f754d0f74d94f11a34a4bc
font_02_sfnt_off00012642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12642 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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