Malicious PDF — malware analysis report

Static analysis result for SHA-256 1543b12b3f717cb9…

MALICIOUS

PDF

105.5 KB Created: 2021-03-17 18:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3bad614840a273977efe8f96e22ca341 SHA-1: 568807826d725be44d01bf2c397aec4991a59f1c SHA-256: 1543b12b3f717cb99fea67eca2ffd71293d3ae52337186ff70695aa90fd88c40
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/wix?keyword=algebra+1+volume+1+answers PDF link annotation
    • https://sosojenanoxo.weebly.com/uploads/1/3/5/3/135316520/6147130.pdfIn PDF document text
    • http://fozivot.mypressonline.com/51584900191.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/maya_angelou_poems_woman_work.pdfIn PDF document text
    • http://nalodorepuwag.getenjoyment.net/27291589463.pdfIn PDF document text
    • http://jabobafom.iblogger.org/renubojakafejuvavel.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/8380765.pdfIn PDF document text
    • http://gojevomarokabe.getenjoyment.net/metro_2033_chapter_4_trolley_combat.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/60_years_of_challenge_pua.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_fc3b824cb7224704b2e0adc1f0676404.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/41063940583.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_0268d2d355014a3d8fed13a7c0fab0ea.pdf?index=trueIn PDF document text
    • http://kuparego.rf.gd/4th_grade_math_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/20329942039.pdfIn PDF document text
    • https://3b9c8e93-52ab-41e8-96f8-e5fc639bf6fa.filesusr.com/ugd/fe3ccd_5c02d4cecaa74613bd7090a26e3c5aec.pdf?index=trueIn PDF document text
    • http://lufevexos.atwebpages.com/the_copyeditors_handbook_and_workbook.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/kenmore_front_load_washer_wont_drain.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/how_much_are_old_fossil_watches_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/informatica_developer_transformation_guide_10._2._1.pdfIn PDF document text
    • http://kalogoraretupo.epizy.com/7847535523.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_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 26792 bytes
SHA-256: 54027d7082d1715692843cc83809aedb56e8faedcf3d96419a82d706c0ffa2b3
font_01_sfnt_off00015f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F70 5340 bytes
SHA-256: 22594a9bba61f102d6cb690a7f330f07f36033ccb974c92c1bdc0d16c5ce10ec
font_02_sfnt_off0001719c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1719C 11420 bytes
SHA-256: 32ad24a133878081d5019b304f9005ced40375c2a44905ad3aee21af6233ea7f

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