Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6977e688eb28a58…

MALICIOUS

PDF

142.7 KB Created: 2021-05-03 21:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 17f6bc32facf6753649c04b4c93ecd1a SHA-1: 29877ce93aee41734d8574f303a165d2fe18986e SHA-256: c6977e688eb28a58d2cb577c2c75e46c7deb489a9a8a319ee14cd5b9f047a895
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=silent+knight+5208+wiring+diagram PDF link annotation
    • http://bossyonlinex.com/download_preset_lightroom_ala_selebgram_free9106p.pdfIn PDF document text
    • http://1fps.ru/what_are_the_4_nitrogenous_bases_of_dnaztdzn.pdfIn PDF document text
    • https://lufosafol.weebly.com/uploads/1/3/0/7/130775677/xegizapexedawa.pdfIn PDF document text
    • https://vojisijekedix.weebly.com/uploads/1/3/5/3/135311469/1285547.pdfIn PDF document text
    • http://jakor.pro/i_am_david_chapter_7vcgvs.pdfIn PDF document text
    • https://biwoponafi.weebly.com/uploads/1/3/4/7/134767969/fosafodawopob.pdfIn PDF document text
    • http://freehookup.xyz/lilidisozunudifada5z5z9.pdfIn PDF document text
    • https://xasibegofijuga.weebly.com/uploads/1/3/4/7/134731363/gesituporusakigubaru.pdfIn PDF document text
    • https://kekuzisalan.weebly.com/uploads/1/3/0/8/130813403/texekuxejiwojud.pdfIn PDF document text
    • http://mapomuwila.22web.org/concierto_de_aranjuez_piano_sheet.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/lepefi/cash_management_job_description_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/jabawakaxobewenom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d0a2a82-79a8-414d-bd40-bbfd2c634351/pememowanejivawiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b23fa7cd-7304-4d1b-af84-40eb1a6609af/londrina_sketch_font_free_download.pdfIn PDF document text
    • http://kopepuxuki.epizy.com/xuzavi.pdfIn PDF document text
    • http://gerubetez.rf.gd/36803572371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/239329fc-3ef2-48f0-9077-253593dc6522/2021_calendar_with_federal_holidays_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/428cbe13-a9a1-4fd3-89bc-79c107801db2/toro_lawn_mower_authorized_repair_center.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a1fa97-4747-4e63-a46e-a9de6fd23c1a/what_is_4th_estate.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_off0001f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F12D 5912 bytes
SHA-256: 8bdb0c01e9ffb3c6f036368568c851adacea94aa2b73fb5652cee194114960e1
font_01_sfnt_off00020535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20535 12012 bytes
SHA-256: ff1591d20fe2decb63f6e980f9476c12f4644b28f61eb8cea96b469353c71c6b

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