Malicious PDF — malware analysis report

Static analysis result for SHA-256 20521c1fd7159b7f…

MALICIOUS

PDF

81.7 KB Created: 2021-03-23 23:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 83b81e498bf46afa8ec692ab188f5c0c SHA-1: cd3c3829386069294151496dbd9721c393e32308 SHA-256: 20521c1fd7159b7fd764de15c7dc0d1208a34809efdda4d6245f10f77a71f7d3
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a large number of links on potentially untrusted hosting. No scripts were extracted, but the overall structure and URL distribution suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/wix?keyword=zeroxposur+jacket+womens+waterproof PDF link annotation
    • https://cdn.sqhk.co/tedefoso/2KYjgSc/dodgers_hat_lakers_colors.pdfIn PDF document text
    • http://kizunawinim.getenjoyment.net/z_for_zachariah_film_cast.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/xikitewukugoxapu.pdfIn PDF document text
    • http://7lessons.space/anton_calculusuq9mi.pdfIn PDF document text
    • http://winoorama.fun/284869331039fmdl.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/sRGjas7/77548717070.pdfIn PDF document text
    • https://miduginoxem.weebly.com/uploads/1/3/4/8/134892771/8004492.pdfIn PDF document text
    • http://fuxanujibiz.mygamesonline.org/cinematography_theory_and_practice_image_making_for_cinematographers.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/cda43e6.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/Iijrjo0/40904011933.pdfIn PDF document text
    • https://welajewovire.weebly.com/uploads/1/3/3/9/133999455/2136536.pdfIn PDF document text
    • http://tb-films.ru/wolverine_f2d_titan_film__negative_scanner_review8uizd.pdfIn PDF document text
    • http://donbetosstreettacos.com/kobunesojetu8xofb.pdfIn PDF document text
    • http://coins24h.com/928557382521r4j4.pdfIn PDF document text
    • https://lugekovatisemo.weebly.com/uploads/1/3/5/3/135337030/kuluzokusozus.pdfIn PDF document text
    • http://luminar2-download.xyz/wususimiz435n1.pdfIn PDF document text
    • https://rozelofesewezu.weebly.com/uploads/1/3/4/0/134040375/xileziwof-xopaxisitu-xadijajeke-silosubil.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/djjxEji/lusabulowuzawatisi.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/Ebhhcji/commodity_live_price_wala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mivurukelino.onlinewebshop.net/pedixovuzib.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/how_to_break_soul_ties.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/statistical_analysis_plan_template_ich.pdfIn PDF document text
    • http://zeteximezoxa.myartsonline.com/werexegipirofegodixenakoj.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/tivujuwuvifadarusejimafan.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_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 5384 bytes
SHA-256: 6c748dda1e50188338b411cdf7cd08700a9eafb9b422b6745019f796c61c7f18
font_01_sfnt_off00011436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11436 10344 bytes
SHA-256: 5462b5f95c6caf93760551b00d21bc571a3b67faec03a9127acba037471aa2d3

Open this report in the interactive analyzer, or submit your own file for analysis.