Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c6f88d0eeba361…

MALICIOUS

PDF

80.5 KB Created: 2021-05-26 10:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1f863588c2e8b965c9fbe471ccb0e19b SHA-1: c1586331931f5a742abaad644a7591feb5c1dd91 SHA-256: 23c6f88d0eeba3610ef9724ff812c5c549ee9461678b7bf83668fea1f3708898
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 5

  • 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.
  • 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://zajinet.ru/strik?utm_term=peter+salovey+and+john+d.+mayer+emotional+intelligence+1990 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386333/normal_600a262744ff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_601815b91626b.pdfIn PDF document text
    • https://duzopuxezofuj.weebly.com/uploads/1/3/1/3/131382696/zexamorugefaninubiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_602669ca785b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454045/normal_5fd2fa4d36b5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453740/normal_60695c08a10ff.pdfIn PDF document text
    • https://nobixerevogug.weebly.com/uploads/1/3/4/4/134481004/5c6a9420f.pdfIn PDF document text
    • https://winalefumigis.weebly.com/uploads/1/3/1/4/131437210/kizavosubodoles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383304/normal_6042c5423d716.pdfIn PDF document text
    • https://vusokozederik.weebly.com/uploads/1/3/4/9/134901716/b72b741.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
    • https://s3.amazonaws.com/tevomenil/zifime.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/what_makes_a_good_manager_interview_question.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43068d8-e9ad-4827-a508-c390ee3d081d/what_is_the_meaning_of_jack_and_the_beanstalk.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/technical_writer_resume_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d6cdf00-c596-4708-9959-fa1b58f6cd72/how_many_calories_in_a_dunkin_donuts_large_frozen_coffee.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/78061159617.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/76886349190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f04889-1b86-4dc6-b1b4-00b3813f6638/what_is_long_run_average_cost_curve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449173b0-e1e5-4b31-8b4c-a9413ddd75bc/excel_vba_find_partial_string_in_range.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/25524348021.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/57395422195.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/jandy_aquapure_error_code_jo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 5764 bytes
SHA-256: 7d771400a8c96c928cb9b45f62aff23afb97fa1d01f875abbd5cb3897c12c7aa
font_01_sfnt_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 10528 bytes
SHA-256: d86bfb3a80bab1ff4890581fa57512c32c00a897e600657ebb065013213de29a
font_02_sfnt_off00012452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12452 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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