Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcde898de23199a…

MALICIOUS

PDF

80.5 KB Created: 2021-06-09 08:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d09d0a02ece54c01a274d25e1ab814e5 SHA-1: 098afc67d2961bed4ce20d661f02484b9a27e309 SHA-256: 4bcde898de23199ac671dc176159523aeffb39b62165804cfad67449a59487c7
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. One prominent URL, 'https://gimoguvi.ru/123?utm_term=360+antivirus+apk+pure', suggests a phishing attempt disguised as a search result for antivirus software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/123?utm_term=360+antivirus+apk+pure PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452862/normal_5fc6afcc4dd49.pdfIn PDF document text
    • https://bijigixeze.weebly.com/uploads/1/3/0/7/130739450/tepulivezuzaxez_zunekuwurowi_sanezixijebe_noxuzigulogikop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409627/normal_5fe29d047bfe1.pdfIn PDF document text
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/d5ada2019299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388289/normal_60566565f1a16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_602c968500f59.pdfIn PDF document text
    • https://tisawisapapaw.weebly.com/uploads/1/3/5/3/135326074/pezizekikeneku-pijemopipegobus-mapavekudo-korekunebeba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454287/normal_5fe10b2026fc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jeveriwilum.pbworks.com/w/file/fetch/144599580/laxezamuvudoviwevil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d49cf4-1da8-4d12-88b1-e40b22985f08/el_arte_de_amar_erich_fromm_libro_completo.pdfIn PDF document text
    • http://tevimunon.pbworks.com/f/jetatuviwuda.pdfIn PDF document text
    • http://xozojonurom.pbworks.com/f/syllabic_consonants_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad8c6d2d-cb8f-4a2e-b44b-36b20038a1ef/reflect_and_relate_3rd_edition_free.pdfIn PDF document text
    • http://zipiwume.pbworks.com/f/89202904457.pdfIn PDF document text
    • http://febevolojezu.pbworks.com/w/file/fetch/144720369/marketing_analytics_data-driven_techniques_with_microsoft_excel__winston_wayne_wiley_2014.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/f/will_sony_xperia_xz_premium_get_android_10.pdfIn PDF document text
    • http://popuwepux.pbworks.com/f/groovepad_full_apk_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4c80b1-41e0-4783-8386-79caf1f63dbb/cuantos_litros_son_un_metro_cuadrado.pdfIn PDF document text
    • http://gibudufu.pbworks.com/w/file/fetch/144596784/22997173731.pdfIn PDF document text
    • http://pefumugat.pbworks.com/w/file/fetch/144537666/dudonewojimezikowopi.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144415869/reading_the_middle_ages_rosenwein.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/7130600121.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_off0000fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 5272 bytes
SHA-256: 61e705c38db131f3ccd1460654e20c3e4da7cdb4184ec4af62c8d534111e737a
font_01_sfnt_off00010da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 11308 bytes
SHA-256: d2f590be0a65af391b020bd471815be113af2644e59928942cc676f9ae1b0523

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