Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3be2fadff982e99…

MALICIOUS

PDF

92.2 KB Created: 2021-04-06 22:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5d1c0696c53e483091dfb972d3c96088 SHA-1: 4184611fd1828293f3a40490ea198aeaba3a835d SHA-256: e3be2fadff982e99a36e4e2107596c9c2969bdcdcf69448f60f7921e656a6c6b
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 at least one pointing to a domain associated with link farming and disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to a chapter test answer key, which serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mezovuduw.ru/wix?keyword=cell+processes+and+energy+chapter+test+answer+key PDF link annotation
    • http://opsnatur.fun/pipe_class_a_b_clgpct.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5ff0c3a72ed9f.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/fIdjaic/how_to_alphabetize_worksheet_tabs_in_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/mamabukalom/hcgjCgd/zufugamilinom.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/how_to_pick_godparents_for_baptism_catholic.pdfIn PDF document text
    • https://cdn.sqhk.co/navuwamas/jeNsJaA/tegesemanaxadotizevem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_5fd82ca51ede3.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/Lahdhcu/youtube_offline_video_download_limit.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/nvojijg/doleb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_60468ff91d66e.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/198887154278oy65.pdfIn PDF document text
    • http://haifaiv.ru/britax_car_seat_expiry_datestob37.pdfIn PDF document text
    • http://tryraisins.club/famoburujovamimalelumuzoltwwf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_60230f36e1e9d.pdfIn PDF document text
    • http://fb-ig-copyright.com/java_programming_language_tutorialbf01z.pdfIn PDF document text
    • https://cdn.sqhk.co/tisumusef/ejgNihD/rurimabebetez.pdfIn PDF document text
    • http://cardioactiveitalia.site/tafoborufegebf5mwd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421613/normal_5fe2a02d4f155.pdfIn PDF document text
    • https://cdn.sqhk.co/pesofesidoke/ibhew6r/bluetooth_software_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/cqghSz1/47171907641.pdfIn PDF document text
    • http://inglassrus.ru/modelos_de_inventarios_probabilisticos_investigacion_de_operacionesxdnmn.pdfIn PDF document text
    • http://podipotekoi.ru/761671187661h3ql.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/tenopebenabezatavexu.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/ia98yER/zugerifu.pdfIn PDF document text
    • http://kavademive.sportsontheweb.net/taurus_pt111_millennium_g2_9mm_pistol_review.pdfIn PDF document text
    • http://aycotoro5.xyz/104706088437sdn6.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/EChf0jc/nizegokivugewojirivas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bokepomi.onlinewebshop.net/binary_code_book.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_off0001273b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273B 5496 bytes
SHA-256: 336f78994eeadc45f1f70953bc8778fda238252408708f4e724a8645629f2199
font_01_sfnt_off000139f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F8 12240 bytes
SHA-256: 662f83cc5434f0af42446b4adbecaed4d2eea747003cb1169313071616135ed4