Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d885579d2163991…

MALICIOUS

PDF

78.2 KB Created: 2021-05-12 12:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 60ceb7f32369ffd9cf9dea40a46257d8 SHA-1: ed3d301358105faf1459154e6909ad7a2fac6d39 SHA-256: 8d885579d2163991273c807690a4d8989b948482739bd147fdb9948feccc0df9
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it is a link farm on disposable hosting, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. The document body, though heavily obfuscated, contains text related to 'how to use apollo twin on pc', which is likely a lure to direct users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=how+to+use+apollo+twin+on+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387218/normal_6042e7f679138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_6011e421deebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467926/normal_604e97d027121.pdfIn PDF document text
    • http://parkji5x.xyz/calendar_2019_hindi_free_downloadkvyzw.pdfIn PDF document text
    • http://daravto18.ru/ultrasonic_cool_mist_humidifier_not_misting0mt3b.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/angularjs_template_if9cybo.pdfIn PDF document text
    • http://keepqifi.space/can_i_get_adobe_acrobat_freea62wz.pdfIn PDF document text
    • http://lastmarkt.ru/wawizenotnbuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_5fd8209794338.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419857/normal_5fcf600707b17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buvekixuj.epizy.com/86681567501.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/wosimovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8bf3976-5d28-4950-9320-bee8a91305be/what_is_the_size_of_a_medium_sweet_potato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7180295-f20f-46af-8f1f-e3bb6c859f9a/tapinedupi.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/archbishop_beck_high_school_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed153e0-b4fb-4f7f-9400-38cfc78a71f9/what_are_the_2021_national_patient_safety_goals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae1e892-12eb-4230-af4a-32243b8f40ef/92920055393.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/advaita_vedanta_teaching.pdfIn PDF document text
    • http://zemikajinemoxi.rf.gd/9160391562.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/79520699894.pdfIn PDF document text
    • http://fijesuluxugej.rf.gd/gororowi.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_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 4884 bytes
SHA-256: 5f4401c75b822b9351a76217af9d6287b49e11332e311966897c6187eaf877e7
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 11564 bytes
SHA-256: 06e85e390d817189c2aaf5044a8e3107343d0d2660eef423781ddf737e7d5cb0

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