Malicious PDF — malware analysis report

Static analysis result for SHA-256 4909f8313e80eb49…

MALICIOUS

PDF

74.8 KB Created: 2021-03-23 02:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d58089f415a114cfbee2c1e4b7f23f6f SHA-1: 2a8c314b58231828836051a2469238d80321d8eb SHA-256: 4909f8313e80eb49e5ef9c179c8fddfb27ed43e2e3c39f3908048b0f9cec3b00
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 pointing to disposable domains, indicating a link farm or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. While no scripts were extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=no+fear+shakespeare+julius+caesar+act+1+scene+2 PDF link annotation
    • http://uuuuull.space/divixuxoxabetovubizoniroru425.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/jga31jh/66317306879.pdfIn PDF document text
    • http://7lessons.fun/29383859185ere4u.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/FVhajhk/lenovo_laptops_on_sale_at_best_buy.pdfIn PDF document text
    • http://flowerport.store/vowejolopofchtbo.pdfIn PDF document text
    • http://sofarabexuki.iblogger.org/capitalization_rules_practice_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vanabigura.rf.gd/android_terminal_emulator_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a94bed6-1387-41ed-b47e-c470810b9274/best_books_for_12_year_olds_classics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba865adf-1377-405b-9ca9-f3355951e0b3/gazivokusugejib.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/what_works_on_wall_street.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/bubble_bobble_hero_2_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a459ce9c-5478-49eb-ba31-5ef234fd29d6/23274658172.pdfIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_8651a87e1c734247866c0ef8299806d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/exiled_kingdoms_start_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c24911a-62b3-4252-b926-c771adf68660/pesetidovufimafal.pdfIn PDF document text
    • http://niworojuxine.rf.gd/bmi_calculator_kg_cm_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/alphasmart_2000_manual.pdfIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_4ec652411f274d2ca914eb15e187441a.pdf?index=trueIn PDF document text
    • http://buxodanukesidup.epizy.com/video_editor_for_instagram_stories_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_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 5396 bytes
SHA-256: fcd5bf288d4bde7f2337e52bf69debfe3fcc064a432884bb6c81b23496e44b71
font_01_sfnt_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 10548 bytes
SHA-256: fb6c52954617505a5cfe9c535492578ee24574aa012dc0d726687ff166576adb

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