Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4febb458c27198…

MALICIOUS

PDF

69.6 KB Created: 2021-06-08 12:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1ff9a0d2e9b40e749cbcd58809178fc9 SHA-1: 57505ae3db0c25f088feaaea2218800980a8e05e SHA-256: fe4febb458c27198fb2d159102deb697201183a6d05993bfb8f2297163efcb57
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting services and utilize UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://oniceh.ru/pbw?utm_term=hidruro+de+bario+ii PDF link annotation
    • https://tepidopuk.weebly.com/uploads/1/3/4/6/134698813/f0d2ead7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_60223dfad75c4.pdfIn PDF document text
    • https://jikevisanudopud.weebly.com/uploads/1/3/4/0/134017539/7430751.pdfIn PDF document text
    • https://puwubebuserow.weebly.com/uploads/1/3/4/4/134403982/konesifuridunibanozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_604de5a4854d0.pdfIn PDF document text
    • https://rojomitalo.weebly.com/uploads/1/3/4/4/134485393/tazadufaralas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383450/normal_5ff77c56690c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_605d0b6b5066c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_5fd100581395a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486965/normal_5fe9d3956a611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407804/normal_5ff4ec2d095e4.pdfIn PDF document text
    • https://vozoduxi.weebly.com/uploads/1/3/2/8/132815828/tonuvasi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tagiruxot.pbworks.com/w/file/fetch/144728499/ziforuwege.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144825852/ejercicios_de_matematicas_6_primaria_santillana_saber_hacer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d2f6fb-eecb-483f-b6e8-9e1b5b521c46/dd_5e_magic_weapons_rapier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70bcbca0-b817-4c82-9271-d87cc22993fe/89299506269.pdfIn PDF document text
    • http://fotowefufet.pbworks.com/f/cleaver_test_online_free.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144422658/zuma_revenge_free_download_without_trial.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144422451/juvixiv.pdfIn PDF document text
    • http://kekirow.pbworks.com/f/sniper_3d_mod_apk_unlimited_money_and_diamonds_2021.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/w/file/fetch/144538635/what_is_r_in_pvnrt_for_atm.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_off0000d2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FE 4712 bytes
SHA-256: b6a0b5bebfb21e43ad900d59ac8cebfd2df7d280cb55d578597039363fcf17f3
font_01_sfnt_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 11608 bytes
SHA-256: 694f51dd33966c1e371660aba600835b3df82d36659e9dc360bf19ad4b940e5b

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