Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6412f31335f4123…

MALICIOUS

PDF

84.1 KB Created: 2021-03-27 18:08:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4f150b5bf529d74d94079803147d14d1 SHA-1: 2348ea7cebcd23c2ff6141c262179eee3448d099 SHA-256: e6412f31335f4123be2c0eb758767261569bbead6799d70ffc6c34ba85855549
66 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, supported by heuristics identifying the PDF as a link farm on disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the embedded URLs point to various domains, some of which are flagged as potentially benign or unknown. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://leonvi.ru/wix?keyword=shimano+nexus+3+speed+gear+adjustment PDF link annotation
    • http://vetovikaxu.mypressonline.com/ipa_consonant_and_vowel_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenixa/XmbeNih/seesaw_apple_icon.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/hcheiaw/dragon_village_granville_lunch_special.pdfIn PDF document text
    • http://rollernefritmassage.xyz/pevomavulomwlja.pdfIn PDF document text
    • http://ctuxuu.com/mudagatubezoyu2bg.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/soxafesepetakofa.pdfIn PDF document text
    • http://help-business-media.com/altivar_320_manual_portuguesa0lw5.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/b3Zjeeo/89050673836.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/htGMJuD/best_delete_tuner_for_2016_6._7_powerstroke.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/b9cPxXg/xabefixodare.pdfIn PDF document text
    • http://pililiriniru.mypressonline.com/adobe_captivate_9_tutorials.pdfIn PDF document text
    • https://cdn.sqhk.co/niporatibu/XGhdhbT/84930404367.pdfIn PDF document text
    • http://kodutizaga.mywebcommunity.org/antibioticos_para_absceso_perianal.pdfIn PDF document text
    • http://tamakar.xyz/nuwudozivakapebidididov4sftw.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/60476359832.pdfIn PDF document text
    • https://cdn.sqhk.co/sabimejuka/ilhegfl/space_drawing_apps_for_android_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ramawotinejog.epizy.com/63606735687.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/abc_behavior_analysis.pdfIn PDF document text
    • http://nogobixa.epizy.com/ejercicios_propuestos_de_caida_libre.pdfIn PDF document text
    • http://rufapapufogap.onlinewebshop.net/vazitibiworobokonagefegu.pdfIn PDF document text
    • http://paguxesij.myartsonline.com/why_was_the_second_agricultural_revolution_important.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 5752 bytes
SHA-256: 6f42057b1f886b19cc1a090caba58fb1135238e5ba8e2cb17d585ede19ca6ca9
font_01_sfnt_off00011d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D99 11100 bytes
SHA-256: fbca976a47b66148a10617f4bfd34e4e84473e4d9899fd5d13279bad9c7c0c3c

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