Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b60bb1616f8b647…

MALICIOUS

PDF

78.5 KB Created: 2021-02-22 22:23:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 58ccede80497267dd99da82ce9ed2df1 SHA-1: e10c13df25b5319bf011d1511a6a9baa0d357bbc SHA-256: 9b60bb1616f8b6470dc81e8a4cb84c16ce03d9acba883324ef8336ae4d425f66
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically leading to 'baarspo.ru/strik'. This URL, combined with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM', indicates a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this document, likely serving as a lure to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=what+are+the+four+stages+of+human+evolution PDF link annotation
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/wabeworezetogiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/eghicup/ufc_fighters_heavyweight.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/yyBhdha/minicraft_2_download_free.pdfIn PDF document text
    • http://fufikozulubus.22web.org/how_to_use_a_degree_to_get_a_job_sims_4.pdfIn PDF document text
    • https://vonekinorosasox.weebly.com/uploads/1/3/4/7/134732286/zavifu.pdfIn PDF document text
    • http://ketorebagibof.22web.org/93432820819.pdfIn PDF document text
    • http://fatimuze.22web.org/bertucci_s_pizza_nutrition_information.pdfIn PDF document text
    • https://nulesurusisozi.weebly.com/uploads/1/3/4/7/134744420/af72ffdb3f.pdfIn PDF document text
    • https://xufefizomuziz.weebly.com/uploads/1/3/5/3/135346589/ae36e95e8.pdfIn PDF document text
    • https://cdn.sqhk.co/vivijuzajus/djegd35/hollywood_action_movies_2018-_19.pdfIn PDF document text
    • https://cdn.sqhk.co/duzixulok/sjccsji/vavudodoxefamutolobiwumed.pdfIn PDF document text
    • https://vulalubog.weebly.com/uploads/1/3/4/8/134862436/tazigumo.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/dogotus.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/bipepezuwed/how_to_clean_lattissima_one_milk_frother.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/62141992962.pdfIn PDF document text
    • http://gevewodex.epizy.com/jesazukolexakok.pdfIn PDF document text
    • http://perevis.epizy.com/negative_formal_command_venir.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/vupil.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/gafev.pdfIn PDF document text
    • http://liwusetokabozil.epizy.com/98678137833.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/wall_laminate_sheets_home_depot.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_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 5252 bytes
SHA-256: 0c18776eaa590cbe2ca60b22d21c874f32791b8502fae893da19262ac5feee1f
font_01_sfnt_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 10588 bytes
SHA-256: ceb78952beedc2eac791a0a5f5554fe8c1d8439ac906b846ef7cfa8b8fca903e

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