Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d1d914c048532b…

MALICIOUS

PDF

80.1 KB Created: 2021-03-31 18:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f9a4370163bc0fa1a4cf1b42a821fdde SHA-1: 7ccdaeffbb767943de626c7627427ead3abe4288 SHA-256: 83d1d914c048532b5d60f8c79edd289c33a44130eecbeaa39b6ccd563c19ca61
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many of which are on disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary URL observed is 'https://mezovuduw.ru/strik?utm_term=ray+dalio+principles+book+pdf', which appears to be part of a phishing or scam campaign. No scripts were extracted, but the PDF structure and embedded URLs indicate an attempt to lead users to potentially harmful content.

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://mezovuduw.ru/strik?utm_term=ray+dalio+principles+book+pdf PDF link annotation
    • https://cdn.sqhk.co/pozuwifofub/gckAqYY/55348411310.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/ahdihwE/dining_table_set_for_4.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/egi4hgI/wuwazexugalunowa.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/bjgETja/xipim.pdfIn PDF document text
    • http://bet-info.ru/how_to_escape_special_chars_in_latexb0moa.pdfIn PDF document text
    • http://usacreditreport.info/what_does_safety_dance_meanv2ig1.pdfIn PDF document text
    • http://tehnotop.site/3418173160309i31.pdfIn PDF document text
    • http://lovelyhouse.online/kopusaridazonadisulixikorutses.pdfIn PDF document text
    • http://profyhouse.ru/glock_mos_instructionscal4j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f7f18a6-afec-401b-8595-73d613e9b69c/75048822758.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_c632253e527e4efea08441e1eec120b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd8a45f-f738-49fb-ac1e-cff3d3f12fa8/mini_cooper_s_owners_manual_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/wedding_invite_templates_free_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718ebcc6-2481-4fad-adcd-0b33467fe18e/wendler_531_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/77892104856.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/the_ransom_of_red_chief_reading_comprehension_questions.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_b6bbc78081aa43e082bc9e77a53ac67b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/294c8a41-817f-4b58-a0a5-72c83db325fd/2097201813.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/83969908394.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_d3bae6839972411895b1dafc1451bb86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf42c1e1-d1ed-458d-b1ee-733a5e7546e3/how_to_install_a_dryer_vent_outlet.pdfIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_84a019313fc649cdbb4da4d7ec044bad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ee6899-79cf-4bf4-bcd5-279b34f1c95c/life_cycle_9500hr_exercise_bike_user_manual.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_1dd25b835a8744878dd92eaf9d2d9389.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_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 5460 bytes
SHA-256: 4f6041fc1bee197dd1ba8adfa66d5f1226160de52470772a899e12a80af198c1
font_01_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 3956 bytes
SHA-256: af7d471dc9e498bbdf415155d23a22cc9dddd3556ac96bb1d234333d2de7f939
font_02_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 11764 bytes
SHA-256: ce31f11693e9718e76337459b7d0888a57e30e7b191a5e5b624ed87c9c878349

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