Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cf8a76496f7be4…

MALICIOUS

PDF

86.2 KB Created: 2021-03-10 01:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f9e2839d4dfac55b1feea56931ea4d2d SHA-1: 255bd0b9264d9f7b3a05527df2b4da367aa0dd4e SHA-256: a4cf8a76496f7be4e874ee75cccc1236901a49f2198aabc43382c8829f3d5365
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm or SEO manipulation scheme. Several URLs are flagged as potentially malicious or redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=which+star+wars+canon+books+to+read In PDF document text
    • http://xenalebosob.scienceontheweb.net/31401965186.pdfIn PDF document text
    • https://cdn.sqhk.co/wetiniwem/iKEfZig/abcd_tamil_songs_video.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/fQjcLtf/31857664250.pdfIn PDF document text
    • https://vumazara.weebly.com/uploads/1/3/0/7/130738753/fotijotegalogemi.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/U7igjeH/hospital_dead_way_scary_hospital_game.pdfIn PDF document text
    • https://cdn.sqhk.co/bajowekununa/btHj8eH/study_tips_for_high_school_students.pdfIn PDF document text
    • https://cdn.sqhk.co/lunabati/ljcjdjh/apple_music_family_plan_annual_fee.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/igdgiha/pixel_launcher_icon_pack_apk.pdfIn PDF document text
    • http://zozavelomidabi.scienceontheweb.net/fundamentals_of_arm_wrestling.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/58888478211.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/7qifwvr/65209616574.pdfIn PDF document text
    • http://pikejofopon.mypressonline.com/89778760246.pdfIn PDF document text
    • https://cdn.sqhk.co/xetasenuwoji/b4jflY7/zig_zag_rolling_machine_near_me.pdfIn PDF document text
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/672ad5d3565040.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/salivujirivina.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekogi/RGjagek/wogemotamudadolazuxidid.pdfIn PDF document text
    • https://pozufijuxib.weebly.com/uploads/1/3/0/7/130775557/6253333.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/fasudikek/96523431660.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/members_mark_grill_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/wixarurovowenet.pdfIn PDF document text
    • http://fonedasin.epizy.com/angels_and_demons_book_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/capital_humano_libro.pdfIn PDF document text
    • http://gipapexof.rf.gd/zopobeveto.pdfIn PDF document text
    • http://fisejotigu.epizy.com/66083958006.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/91911087927.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/hey_there_delilah_sheet_music_piano.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_off00011536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11536 5304 bytes
SHA-256: f6327151ce06335650c18eaa954a7d0243d8c990c5ce7087f3cd204687668f64
font_01_sfnt_off00012755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12755 10496 bytes
SHA-256: b540e1c628079044579badff85e1ec1cac303a5eefe962744d061c63749ab531

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