Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6af1238e46c8d7…

MALICIOUS

PDF

73.6 KB Created: 2021-02-23 20:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 519e3509c6aa3db771db6ef7f978c575 SHA-1: d58e27719e37646ca8511e7b4f9da5393b5f5c4b SHA-256: 7b6af1238e46c8d72fc2985ea541f3a024c2ac8539521383a65bbe59c9f7282f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically phishing. The document body, though heavily obfuscated, contains text related to game cheats, suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/123?utm_term=pokemon+fire+red+cheats+gba+emulator+infinite+money PDF link annotation
    • http://segorewadidet.iblogger.org/1530931614.pdfIn PDF document text
    • http://wutoxurusot.iblogger.org/levojijiraxu.pdfIn PDF document text
    • http://tonadep.22web.org/china_invitation_letter_for_business_visa_template.pdfIn PDF document text
    • http://arthromedro.xyz/dukulamibod6dfq2.pdfIn PDF document text
    • http://drive4mclaneaustell.com/1740320179z9vsx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuboxevu.epizy.com/7083669009.pdfIn PDF document text
    • http://bexiguxiluk.epizy.com/alzheimer_s_disease_fact_sheet_2018.pdfIn PDF document text
    • http://mikugux.rf.gd/android_splash_screen_androidhive.pdfIn PDF document text
    • http://wajutomagavugaz.epizy.com/how_to_read_chemistry_formulas.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/23801279842.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/b_t_c_book_ka_full_form.pdfIn PDF document text
    • http://xukenefurirog.epizy.com/ms_access_data_form.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/19819129004.pdfIn PDF document text
    • http://zosajaxuv.epizy.com/xewigolo.pdfIn PDF document text
    • http://maladovefo.rf.gd/tonalasilikuvaderazex.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_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 5740 bytes
SHA-256: c08e96a7a1e3d196f01fb0c0bca3f6b101edcb6d1a40c1c83f9a42d8d3f83476
font_01_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 11552 bytes
SHA-256: 842de82fc8df587fde2fcd2f344f3299b563d0634ebfebc251e1c409787d4845

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