Malicious PDF — malware analysis report

Static analysis result for SHA-256 53021f9ba26fc8c7…

MALICIOUS

PDF

120.3 KB Created: 2021-05-01 07:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4d48a57a937fcea71d764c87150efe20 SHA-1: c96b53113aea5d6ee24e1f32c9a97100da6c2936 SHA-256: 53021f9ba26fc8c7a7e8dfe6a574a8a7a732829234f0afbb6b41d682c1320c90
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, often as part of a spearphishing campaign.

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=what+is+the+top+1+percent+income+in+california PDF link annotation
    • https://cdn.sqhk.co/lebudawojafi/0Vqjeja/kingston_area_soccer_league_kingston_ny.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/hhKAJrO/patipovugunipoxowetepizev.pdfIn PDF document text
    • http://delayikapy.xyz/traffic_racer_unlimited_money_apk_iose9u8p.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/gibBSig/97600937682.pdfIn PDF document text
    • http://bachanalytics.com/apple_books_vs_kindle_pricesbxlfj.pdfIn PDF document text
    • https://cdn.sqhk.co/fagisuxupinu/gjhdeMO/party_balloon_arches_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/idjbgiG/tasty_words_level_11_answers.pdfIn PDF document text
    • http://brumbum6.xyz/sims_3_expansion_packs_free_origin_codesvsbos.pdfIn PDF document text
    • http://gerda-msk.ru/portrait_drawing_artists_australia4pq5w.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/86149615677rjtn9.pdfIn PDF document text
    • http://lavorunolutoga.22web.org/suwejovuse.pdfIn PDF document text
    • http://plsale.pro/xeforogavomevanixazobuna9p2.pdfIn PDF document text
    • http://national-verifyteam.com/zavadudojakufaneri7gwhg.pdfIn PDF document text
    • http://sibuvre.com/wugedudi0hcd.pdfIn PDF document text
    • http://good-production20.site/63253380906z6xzw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kixasudasiwub.epizy.com/55072137408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c77a12eb-0d6c-449e-bccf-84bb6ab19815/jexumawuzapegizevaxogaf.pdfIn PDF document text
    • http://nowaginog.epizy.com/53009962718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e4f83d-d669-4792-8299-389114d3e496/behold_our_god_uke_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54204b14-1f50-4e1c-baec-1a467b0f221c/56884029136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b4c1ce-81cd-434a-ada6-7365fab34214/how_to_retrieve_voicemail_from_panasonic_phone.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_off00019796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19796 5320 bytes
SHA-256: 9ad23d03844c0b990b0f0420be43a30ca33cc38ca1e781470eb28e8ae4404327
font_01_sfnt_off0001a996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A996 12180 bytes
SHA-256: 131fce8374f21eab53e17077a85d382374e8e9cb1bfd7db30237c1effb860b33

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