Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35293a6c5bf253a…

MALICIOUS

PDF

100.1 KB Created: 2021-06-10 21:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5f6a4ee9347d5fff7664a8949ee2db68 SHA-1: d8b5e96bc83cdd1eb08dc2e52143b112bab1882b SHA-256: b35293a6c5bf253afe2d2a7fa79bc279167f58bf11125367c272f18fb97d308f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a site that appears to be a lure for downloading a PDF related to 'DNA structure and replication'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm on disposable hosting, further supporting a phishing or malware distribution scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://jottigo.ru/123?utm_term=dna+structure+and+replication+pogil+answers+pdf PDF link annotation
    • https://pozitolize.weebly.com/uploads/1/3/4/3/134330731/8523515.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/wevorop_jeruvol.pdfIn PDF document text
    • https://nizawubanivud.weebly.com/uploads/1/3/4/5/134529200/rapivovexot-tixutenufaruluw-gijutini-xoxegulur.pdfIn PDF document text
    • https://xezolemi.weebly.com/uploads/1/3/5/3/135324657/82831.pdfIn PDF document text
    • https://getomipo.weebly.com/uploads/1/3/4/4/134403721/e504c5b0f6330.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siruzosu.pbworks.com/f/dotedizewufobexigaken.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/f/gutobenaremasonukaxuk.pdfIn PDF document text
    • http://bekiravetad.pbworks.com/f/how_to_use_cricut_explore_air_for_beginners.pdfIn PDF document text
    • http://fevosezew.pbworks.com/f/maxikirefebe.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144463899/71617410458.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/f/lenovo_yoga_book_yb1-x90f_pen.pdfIn PDF document text
    • http://nefusim.pbworks.com/f/how_do_you_get_free_skins_fortnite_battle_royale.pdfIn PDF document text
    • http://wixumip.pbworks.com/f/99667559887.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144585909/98864468586.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144411729/pevozibexegikadokuz.pdfIn PDF document text
    • http://mevuteled.pbworks.com/f/miracle_thunder_2.82_crack_setup.pdfIn PDF document text
    • http://bojirakaj.pbworks.com/w/file/fetch/144904866/grade_7_math_word_problems.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/gestion_de_talento_humano_idalberto_chiavenato_tercera_edicion.pdfIn PDF document text
    • http://munonoraze.pbworks.com/f/96864152334.pdfIn PDF document text
    • http://xifatarege.pbworks.com/w/file/fetch/144549693/skyrim_mod_argonian_armor.pdfIn PDF document text
    • http://wirabofitox.pbworks.com/f/73888372418.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144849651/72262863458.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/46564000295.pdfIn PDF document text
    • http://ropotupi.pbworks.com/w/file/fetch/144639684/69000059316.pdfIn PDF document text
    • http://mokakiw.pbworks.com/f/new_marathi_serial_ringtone_2020.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_off00014727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14727 5416 bytes
SHA-256: ded87c23991f07163057c7ae867b87419578bef78b4f285d539544bb1a8410b5
font_01_sfnt_off000159be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159BE 12196 bytes
SHA-256: 98365eff6008425614a2779f493b725a7b6a3a77313d9b3ad1e54916dff2d128

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