Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a8efde0505a7d8…

MALICIOUS

PDF

78.2 KB Created: 2021-03-31 21:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7c224f7c17a0f8e75c7d609ee7dbeac1 SHA-1: 730bb3e03d27dbc60c13b60e11b0afa5fba5d172 SHA-256: f1a8efde0505a7d82a371155cf61bd2c6113d679f222c7e1792b86aec3c82fd1
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 0.9998

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://gimoguvi.ru/strik?utm_term=toastmasters+table+topics+description PDF link annotation
    • http://tanubujurutemut.scienceontheweb.net/36087352920.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://topuniversityru.fun/vutibovuxuz8yua.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/89488568687.pdfIn PDF document text
    • http://info-pages.ru/vasedanupubiresurugidikebyd3ac.pdfIn PDF document text
    • http://agencymedia-ig.com/the_game_movie_1997z9jd6.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/beej_network_programming.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukajevo/4443375412.pdfIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_4561a4e81a694f69a31c7b969bf1e663.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/site_visit_report_sample.pdfIn PDF document text
    • https://592f3795-292b-4eb7-bb82-ca7d83343d16.filesusr.com/ugd/44d997_12d080c21a3b449eb0f6096359a2750a.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_78e2f4909b65414aada667a5dadacadf.pdf?index=trueIn PDF document text
    • https://ad646471-8556-449a-8150-55a6f6ff724f.filesusr.com/ugd/7a1c5b_c3cfc3147f414f3b96da62a680dfe74d.pdf?index=trueIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_9fe4f35e549c47d1af83b9a276151595.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suximawo/61378444686.pdfIn PDF document text
    • http://dafukip.myartsonline.com/cambridge_english_for_human_resources_teacher_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/tajimunugixibupuwop.pdfIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_0c3a6ceeec3a49408264d1329fa3c1cc.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_4e766db1de314f2fb7ea20fa11fcce4c.pdf?index=trueIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_5c4084698fa54eab8445860a07109215.pdf?index=trueIn 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_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 5308 bytes
SHA-256: de215150d1ca601f0e61118c31a6d01d1020d61d488c783bc36461f448c51d40
font_01_sfnt_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 10856 bytes
SHA-256: 9095202931045e2921b2d7d074593523cba4fda66865e71c8e60af96d198cb98

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