Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa77dbe4f22ec96…

MALICIOUS

PDF

74.8 KB Created: 2021-03-02 08:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f18cb10acfbf2cca712db0ba285069c0 SHA-1: 929ac42bab23632e7776d35dba6925cd406b5dcf SHA-256: 6aa77dbe4f22ec96e77b9490c969b6ebdf794430a95b7d42d547e2d1eb2e4e94
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=pf+525+f111 PDF link annotation
    • https://cdn.sqhk.co/vovawumusa/PjdQLjX/24641813818.pdfIn PDF document text
    • https://wipasokewuwil.weebly.com/uploads/1/3/4/0/134000036/c368ffe6a01c4.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/ighhlay/skins_2017_movie_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/gjhh3Ry/30546652072.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/0jbhghj/95733819462.pdfIn PDF document text
    • https://negogesi.weebly.com/uploads/1/3/0/7/130739616/1866245.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/iehhdzQ/duremixozarapexi.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/74482956558.pdfIn PDF document text
    • http://dumanejixaw.66ghz.com/zalotopimifofifajudope.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/the_hunger_games_2014_full_movie_download_in_hindi_filmyzilla.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/BYjdkja/how_to_play_chinese_chess_online_with_friends.pdfIn PDF document text
    • https://cdn.sqhk.co/nerurepaza/i9Isibi/20724390856.pdfIn PDF document text
    • https://sujibovuf.weebly.com/uploads/1/3/4/7/134705076/42079.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/jaigcjd/bingo_caller_app_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/cYJhhj8/49176529990.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/idPgfPg/bosugalakixovugo.pdfIn PDF document text
    • http://vasetar.iblogger.org/45671582074.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kasegek.rf.gd/mejularupesomofij.pdfIn PDF document text
    • http://mojozore.myartsonline.com/13401370073.pdfIn PDF document text
    • http://retexibew.rf.gd/gerlach_report_gbe.pdfIn PDF document text
    • http://pabotojixupi.atwebpages.com/fuwamiza.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/fundamentals_of_logic_design.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_off0000ded9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED9 4556 bytes
SHA-256: 58e07680ffcfbffe7c463e2ec940be93eb983ccc518b2274ae85031c6fbc6889
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 14880 bytes
SHA-256: 5c7a882cd38b6bafbdfd5859767b710b633241fea6ecee4cdd64119664f1a1c5

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