Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a1c14eb2543796…

MALICIOUS

PDF

96.0 KB Created: 2021-04-19 22:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3b31f5fd82d12b357f2ba0300fc4a969 SHA-1: 8c1c6f2c636e165560abc49c6ea3ca283fed6cc3 SHA-256: 82a1c14eb2543796ba9a25d8c06ad4227e927d4809441eb2c14d18aaee674b8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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/strik?utm_term=is+there+going+to+be+a+movie+for+red+queen PDF link annotation
    • https://kozewililusu.weebly.com/uploads/1/3/4/0/134013002/9038830.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/xggDheR/deloitte_asc_842_lease_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/j2hgbuI/85065831931.pdfIn PDF document text
    • http://lufosopaxukil.getenjoyment.net/formasi_cpns_belitung_timur.pdfIn PDF document text
    • http://xtreme-sport.ru/giduxujoj9ccyh.pdfIn PDF document text
    • http://dhl-order.info/marine_corp_drill_instructor_speech5ehp7.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/JSNI5jc/into_the_badlands_blade_battle_mod_apk.pdfIn PDF document text
    • http://silvanozito.online/how_do_i_save_baby_groot_in_fortnitectu0x.pdfIn PDF document text
    • http://itmax.info/kujedujosawogeduzelalk1juy.pdfIn PDF document text
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/sarawifabajod.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/gcihJai/sonic_adventure_nintendo_3ds.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/whats_the_best_9kg_washing_machine2nogt.pdfIn PDF document text
    • http://shoop-fk.ru/22897496197218ji.pdfIn PDF document text
    • http://madamzero.com/xixosotatikikozuxi4dm55.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://runuwug.myartsonline.com/sapidevabotememixup.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/51270294616.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/53257622196.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/46416679710.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/66583322694.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 5436 bytes
SHA-256: 26ee063a19c95d8e1acf84548cde647ae4cf15df3a409f3f16e3c68aa4eea2f8
font_01_sfnt_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 3132 bytes
SHA-256: 69c8313975e996a3908a1d14c60378ca0fb57f1e73e4b89498c94d9bd7765ecd
font_02_sfnt_off0001267f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267F 11544 bytes
SHA-256: 5c7d1985d6b3325c1f183c3808d67b6ff5e701e01054652236c0c69fa7198b83
font_03_sfnt_off00014daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAF 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660
font_04_sfnt_off0001633a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1633A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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