Malicious PDF — malware analysis report

Static analysis result for SHA-256 1844ff7bc57715ee…

MALICIOUS

PDF

78.5 KB Created: 2021-03-18 09:16:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dce560590fac7a1fbe005bf92f3721c6 SHA-1: c0bca8827174db2eeb80f70bab03bc6e7cb9f57f SHA-256: 1844ff7bc57715ee138936e4038d1526748d2b5409b4642691dd1a4157a43479
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=certificado+medico+escolar+2020+cdmx+pdf PDF link annotation
    • http://zokazurimila.mygamesonline.org/almanach_vermot_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/Xjc1ggb/zumubejojavopovezamu.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/dhcgduz/wosefiwopebuvixobakani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_602d6969b2b09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5fee80747976c.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/cPDjhii/barbie_magical_fashion_mod_apk_2._6.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/ZiengcL/pics_studio_apartments.pdfIn PDF document text
    • http://pexarinolal.mypressonline.com/arithmetic_sequence_problem_solving.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/hc4jjia/skater_skirt_black_and_white.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_6014e36ee6afa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d98f91d3-5795-4853-b533-c7a4949d0061/80710906915.pdfIn PDF document text
    • http://jababonulet.epizy.com/ser_bachiller_2020_preguntas_y_respuestas.pdfIn PDF document text
    • http://mifofoxidil.onlinewebshop.net/cisco_ccent_book_download.pdfIn PDF document text
    • http://zuruxiwowasigu.epizy.com/suxifef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff4dd67-ca2d-41ea-b108-2937f3e1eed6/mutev.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/lapasigedubivoniwaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee5f52f-99b9-4635-9151-dcd7a32e870b/92506253598.pdfIn PDF document text
    • http://vavadot.onlinewebshop.net/61815190586.pdfIn PDF document text
    • http://jipipazed.epizy.com/cuantos_metros_cubicos_tiene_un_kilometro_cubico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9699c9-3961-4ddf-bfce-06c07bfa9770/volkswagen_mechanic_shop_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ccd5e25-9903-45e7-a59a-31d2a49d53ae/android_studio_bookmark_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49781f65-cc6f-4d5f-80dd-30e3166907cc/62745253257.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_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 5548 bytes
SHA-256: cab65b106080d7e619487d19979bca29291f07420b4e3ab23bd98048d558aab5
font_01_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 12020 bytes
SHA-256: 45edade58259d3a47dcadc158b0e04a44462297a0426b0b769e802f0e1fe9ac1

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