Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba89cc16d79c34c…

MALICIOUS

PDF

77.2 KB Created: 2021-04-01 09:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 41e573f09aa37c1ee482554b096af3db SHA-1: 9bce05ad39f710cd2035437149cf9c2c321ec46c SHA-256: 4ba89cc16d79c34c26c5e952bad40eb96bb8616dbf9ead0a22ef5833220cdffc
134 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. It uses an invoice-themed lure. 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 0.9991

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://botokaw.ru/award?keyword=libro+automatismo+industrial+pdf PDF link annotation
    • http://tigawadilen.iblogger.org/bioremediation_files.pdfIn PDF document text
    • http://mafonofolifeda.22web.org/contemporary_sociological_theory_calhoun.pdfIn PDF document text
    • http://umniashka.ru/29711060347n72g1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450419/normal_5fefd200b545e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402940/normal_604140d823088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_602c602ab69e4.pdfIn PDF document text
    • http://zuzutefiro.22web.org/dufusepefelosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_60635f3b7a515.pdfIn PDF document text
    • http://portkamesto.site/what_kind_of_oil_does_a_2016_honda_odyssey_takepf8ny.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_604dc66367d3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421461/normal_5ff5bac7488e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_604eb98912897.pdfIn PDF document text
    • http://jetanevuv.iblogger.org/aging_as_a_social_process_6th_edition.pdfIn PDF document text
    • http://mini-cam1.club/xasubomjr7r3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457006/normal_60035d90bb531.pdfIn PDF document text
    • http://kosolibanun.iblogger.org/sisixiliduzo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://simarawi.epizy.com/85921963533.pdfIn PDF document text
    • http://mogikujerezegu.epizy.com/practica_cariotipo_humano.pdfIn PDF document text
    • http://nujopeko.epizy.com/sevosasorelo.pdfIn PDF document text
    • http://xakizeko.epizy.com/cell_city_analogy_practice_answer_key.pdfIn PDF document text
    • http://redanewirejawub.epizy.com/libuzuraj.pdfIn PDF document text
    • http://lojuwuwa.rf.gd/medical_nanotechnology_and_nanomedicine.pdfIn PDF document text
    • http://vukanaxugosazed.rf.gd/dry_fly_innovations_fishing_report.pdfIn PDF document text
    • http://jizirolizeguwok.rf.gd/how_long_does_a_letter_of_recommendation_last.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_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 5268 bytes
SHA-256: da08409187e7a230eaee6925bee827da219858c8c9ec5c7330b44f1b484ff9ec
font_01_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 11724 bytes
SHA-256: 19584cb0f7a3ed4f693dc7de4cc259729291a1708fad43d7ec036afd34f03f10

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