Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4261193038bdec9…

MALICIOUS

PDF

76.7 KB Created: 2021-04-29 02:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 16e11064d97438294cee033f0ecf6bf8 SHA-1: 527ea78b01efd18df57e4d57c4bb83204e4bbd33 SHA-256: f4261193038bdec9dd7bede3ae347379d8fb847fa98059b504b68e2d2a55ae19
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 0.9999

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://midufefew.ru/strik?utm_term=speed+queen+washing+machine+good+guys PDF link annotation
    • https://viwoseloza.weebly.com/uploads/1/3/4/8/134861971/2135312.pdfIn PDF document text
    • https://jutokikifugata.weebly.com/uploads/1/3/1/0/131070124/kefazepe.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/HjaWClX/saxupikunonanaziriwati.pdfIn PDF document text
    • https://cdn.sqhk.co/tejikeluz/gs8Oehd/c64_emulator_download_windows_7.pdfIn PDF document text
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/4d0f6eb6185e574.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/atjiRhd/funny_valentines_gift_ideas_for_him.pdfIn PDF document text
    • https://cdn.sqhk.co/zafowavo/2ocrNie/xawivonapegevovogulixu.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/ghifPha/97284367277.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/pukaridimupo/53733496161.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/emerson_3051s_wiring_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/gurisokoxegutavex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9abece83-5329-48f1-8e0d-44a40954e879/51509418646.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/28875749469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a11936-48c6-4274-be48-e2e12b5629f2/yin_r._k._2013._case_study_research_design_and_methods_5th_ed.._thousand_oaks_ca_sage.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/fernwood_primary_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/fabevaxorugiwodanidu.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/identifying_prisms_and_pyramids_worksheets_grade_3.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_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 5780 bytes
SHA-256: 85e1444c7117668d090998c76b7ab26e671da230286c1de9de83552126fa3bd5
font_01_sfnt_off0000fef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 11004 bytes
SHA-256: cb5c7d2d334e044f1bc0c5159e552ea520932d216ae545d0f7b7e2910a40e549

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