Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51344aebb22cc27…

MALICIOUS

PDF

89.2 KB Created: 2021-02-06 07:38:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0dc784e0911ad35ff363af3a703bd61c SHA-1: 6d4ad42d5c1bdb65bea632dbd4b5e64f1b114cce SHA-256: f51344aebb22cc275a0d20fd5612afc22726cc311c26bfa186f1f9c66d34c477
184 Risk Score

Malware Insights

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

This PDF file contains numerous links designed to redirect users to malicious websites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious. The embedded content, though heavily obfuscated, appears to be part of a lure, likely related to search engine optimization for specific topics.

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
  • 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 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=rise+of+nationalism+in+europe+notes+pdf In PDF document text
    • https://kejopojoki.weebly.com/uploads/1/3/4/0/134018111/topijona-puvoninafadote.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369336/normal_5ffd0615ce1c7.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/ssluhhS/68478861506.pdfIn PDF document text
    • https://bewotababuruga.weebly.com/uploads/1/3/1/1/131163836/c2dad0dea.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/hfAghdC/airplane_crash_dreams_interpretation.pdfIn PDF document text
    • https://titerafutar.weebly.com/uploads/1/3/0/7/130775646/dupasoreta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fccc3447a8fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485693/normal_5fe0a65800f27.pdfIn PDF document text
    • https://pebogifi.weebly.com/uploads/1/3/1/4/131438694/gasekevuwunuv_beradezasexevu_femapavakuta.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/djclYtm/kipagiguradatif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_6017262837e96.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/CUhghh7/32345542996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://robinovedibepo.epizy.com/zivupadusat.pdfIn PDF document text
    • http://melumudinev.epizy.com/candy_crush_saga_hack_apk_unlimited_boosters.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/golden_arrow_vector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/dubuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/24661415636.pdfIn PDF document text
    • http://wuxatafadakifu.epizy.com/6727761134.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 5196 bytes
SHA-256: db1d6eeb12b3b1ae985c5195856d42cb1216130dcabc50ba02da3cd32ff8cdd4
font_01_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 10268 bytes
SHA-256: 06ce13ad9d2d54499d62b438772442454031005d77bd7985aa2e12c5d58dd30e
font_02_sfnt_off00014226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14226 16224 bytes
SHA-256: 3230dce6ac9cc1c618afe6e700bc01bad4c14b8490cb7e773368fe91bfaf5e97

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