Malicious PDF — malware analysis report

Static analysis result for SHA-256 510fc8b53a9183f6…

MALICIOUS

PDF

76.4 KB Created: 2021-03-28 20:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a7cc2a243fe790e0c792a7fe1014fdba SHA-1: cbc39270d54dd498b35a3ff60559c3e02736c041 SHA-256: 510fc8b53a9183f63c641b285f2af759d642af9ddd9897cb0eade4bbb34fb8eb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

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 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://seumenha.ru/strik?utm_term=diablo+2+lord+of+destruction+best+mods PDF link annotation
    • http://meinekarten.best/possessive_adjectives_long_form_spanish_worksheet_answers007m3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428331/normal_5fe4d47701c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_601b35cb304c4.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/sivudilarume.pdfIn PDF document text
    • http://netewe5.xyz/le_bon_la_brute_et_le_mordecailiko9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_602e24b0a556e.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/32095356.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/44897671396.pdfIn PDF document text
    • http://fuwenosod.iblogger.org/piwowalobem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480588/normal_5ff2b6efdfc83.pdfIn PDF document text
    • http://saniwofixapu.mygamesonline.org/dibudesa.pdfIn PDF document text
    • http://universe1.space/what_is_the_best_water_flosser_for_dental_implants2gfba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5ffd7cde3c5d7.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/wulagisi/31157932532.pdfIn PDF document text
    • http://nebamolowitumik.epizy.com/search_form_sql_injection.pdfIn PDF document text
    • http://nemiropeseti.rf.gd/cuantas_etapas_tiene_la_metamorfosis_de_una_mariposa.pdfIn PDF document text
    • http://nitabuziki.rf.gd/72642870275.pdfIn PDF document text
    • http://nejexapef.rf.gd/math_word_problems_9th_grade_with_answers.pdfIn PDF document text
    • http://semedefarewunoj.rf.gd/bushnell_tour_v3_carry_case.pdfIn PDF document text
    • http://bejuzijufure.rf.gd/bihar_tet_2020_computer_science_question_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/movies_anywhere_apk.pdfIn PDF document text
    • http://kepewitibafef.myartsonline.com/zotonudinowif.pdfIn PDF document text
    • http://nimukefamax.rf.gd/82004645155.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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 5440 bytes
SHA-256: 3c87b88acbdad784397632d4f3f6d11e1bda7bcee4f922565fdf8cf42c5cd70a
font_01_sfnt_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 10676 bytes
SHA-256: 270a475dce92cab4a64d7086c0f0897ed5600435ca585bab73f6083bfb98faf4

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