Malicious PDF — malware analysis report

Static analysis result for SHA-256 877dd54c515de1ca…

MALICIOUS

PDF

76.4 KB Created: 2021-03-18 14:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bea8ff3a99c7728afa61f1efb42050a5 SHA-1: 7c432ea6d286f2e123480bbec0aa7c716dec5c51 SHA-256: 877dd54c515de1ca55876c8c8ab98c0f7fec19b840c19db09a078fa5cf3dc011
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL, 'https://botokaw.ru/strik?utm_term=python+pandas+tutorial+for+beginners+youtube', is directly referenced in the document's metadata and heuristics. The document body, though heavily obfuscated, appears to contain text related to a Python tutorial, suggesting a lure to disguise malicious links. The presence of external URIs and link farm characteristics strongly suggests the document is designed to redirect users to potentially harmful content.

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://botokaw.ru/strik?utm_term=python+pandas+tutorial+for+beginners+youtube PDF link annotation
    • https://pefolasonej.weebly.com/uploads/1/3/4/9/134901659/nogud-janegenezun-kelewabugin-dokagasuwugiz.pdfIn PDF document text
    • http://8bitbeardsco.com/55864963622vot09.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/ngjUoLO/cross_color_jean_jacket.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/cHbq3gf/hero_wars_dungeon_pattern.pdfIn PDF document text
    • http://gupozatu.22web.org/winrar_for_pc_uptodown.pdfIn PDF document text
    • http://moneyindia.site/a_lesson_before_dying_chapter_15_quotesjzrbn.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/pvWnRhh/62135591683.pdfIn PDF document text
    • http://prodson.fun/33849922868enu9k.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/1988f3b.pdfIn PDF document text
    • https://cdn.sqhk.co/sidigodoga/qVgjWid/tetupedi.pdfIn PDF document text
    • http://lamatokatov.22web.org/42884940972.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_9a683a2b331f4afa84ef9ae0cb3947ac.pdf?index=trueIn PDF document text
    • http://medevigad.epizy.com/53794306692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb13fa7d-2353-472d-9fc9-40c7fa2adf52/29310357099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21fee977-35b4-43f5-bca9-7bcec7ee579d/countable_and_uncountable_nouns_worksheets_for_grade_6.pdfIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_44a068228bc04eebb41f1c4c120fd7f3.pdf?index=trueIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_94e166f8308342edb4428c163a445608.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9804edcf-45a6-4d5c-bfa5-fab45df74f65/why_is_the_router_blinking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50bba394-6e39-4e65-b901-b3ab2c568889/western_snow_plow_parts_store_near_me.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_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 5544 bytes
SHA-256: 58f3d888c9c947d456d21c97a7fb8849806caaad0fc86707f90197f0945d5f2e
font_01_sfnt_off000100ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 10416 bytes
SHA-256: 3f37c8a0d2edd108c987c2a69fc9ec6e97f510479337593e7121970ed0e6b5d2

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