Malicious PDF — malware analysis report

Static analysis result for SHA-256 188e9024ab9fcc36…

MALICIOUS

PDF

76.2 KB Created: 2021-04-01 01:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 846f9fb524f394877744de253fb96fbf SHA-1: 5e40451a0f6a05383b0792ca375e2f684ecfdc52 SHA-256: 188e9024ab9fcc36fe622669c33014f34f3c6fc25724bbbc797c117cb7ea6bfc
186 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains text related to a "first alert onelink wi-fi smoke & co alarm review", which is likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/aws?utm_term=first+alert+onelink+wi-fi+smoke+%2526+co+alarm+review PDF link annotation
    • https://cdn.sqhk.co/fodexuxefeba/ieia3Rv/bird_of_paradise_plant_flower_indoors.pdfIn PDF document text
    • http://vemibuw.22web.org/gramatica_basica_del_estudiante_de_espanol_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nadovexum/jEhaghj/13255064724.pdfIn PDF document text
    • http://niverokime.iblogger.org/ancient_greek_clothing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451929/normal_5fdd9d06e3ea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_60356d32c58e2.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/A1YmiiS/age_of_empires_2_definitive_cheat_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/6crRuA5/tsuki_adventure_halloween_items.pdfIn PDF document text
    • http://mijolek.iblogger.org/foreign_used_toyota_sienna_2006_for_sale_in_nigeria.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wosolakelufix.epizy.com/jewakusabubet.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_7d3bb7eff7fd47a8bf809bd9e79874ad.pdf?index=trueIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_155d6ca0e08641dcb8e93d2fa551e400.pdf?index=trueIn PDF document text
    • http://lufefavi.epizy.com/halmos_measure_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19381f1-2a3e-4b4b-9d5a-1852673f0039/26817059446.pdfIn PDF document text
    • https://96a604d4-6f4e-42dc-90fb-b802e1cf4ed0.filesusr.com/ugd/6ef60c_e5fa4f9f3e924683b53a6c73ec15eb6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa99ccdc-1d62-4851-838b-f713af1d3153/4700823689.pdfIn PDF document text
    • http://joxegav.rf.gd/dawowotinetivisef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 4844 bytes
SHA-256: d6a427ecb29cf1f6a8752cb21068a72ba7801af9645479ac61431acc28eaf5d0
font_01_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 11024 bytes
SHA-256: c8f552f1a40a80c65489c1b16fa9677970a8485ddc8fdef15bd9bde8f5b2ddd0
font_02_sfnt_off000115af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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