Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b78ca495b0d9b4b…

MALICIOUS

PDF

73.5 KB Created: 2021-04-03 21:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 090e88801cfef9bf6e0c719650ac566d SHA-1: 0acad8dec48cd7d9bf7019e73fd28804c694dc61 SHA-256: 1b78ca495b0d9b4b2c806c25154af08985aad40c27e97bc164daf9a30efa244e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external URLs. The PDF structure and embedded URIs suggest it functions as a link farm, directing users to potentially malicious websites for phishing or malware downloads. No scripts were extracted, but the presence of multiple external links indicates a likely intent to redirect users to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=descriptive+vs+inferential+statistics+pdf PDF link annotation
    • http://varuzajuv.22web.org/samsung_allshare_for_pc.pdfIn PDF document text
    • https://tajamopem.weebly.com/uploads/1/3/4/7/134745730/cac99e21a26.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/gj2Thja/pulenuvenam.pdfIn PDF document text
    • http://genusttwsr.fun/xijanutelagizovrv9ap.pdfIn PDF document text
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/1392664.pdfIn PDF document text
    • https://tonofoku.weebly.com/uploads/1/3/4/0/134096462/sawavo-konosegepib-xuketose-tukejisawox.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/jj4jggw/2000_club_car_carryall_manual.pdfIn PDF document text
    • http://idclick.cash/20678874362zg0ta.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/Mlhfugh/find_my_iphone_icloud_offline.pdfIn PDF document text
    • http://leomannapov.com/cross_aldol_condensationb6bic.pdfIn PDF document text
    • http://karnaval.host/dir_655_als_access_point5rvb5.pdfIn PDF document text
    • http://tryadasert.online/30475744500yblit.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/41809018623.pdfIn PDF document text
    • http://priz24.site/oyunsunucum_cs_1.6_bot_paketi4ok7q.pdfIn PDF document text
    • http://znalomstvavip.site/98994449868aesry.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/what_does_progressivism_mean_in_education.pdfIn PDF document text
    • http://xazapefunel.getenjoyment.net/cancer_de_mama_en_venezuela_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pidosowot.epizy.com/free_hourly_agenda_template.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/21323268862.pdfIn PDF document text
    • http://fakomufe.epizy.com/koruxekotimozelo.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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 5208 bytes
SHA-256: 8a2f34a4936a93a3083934e111b8c29b1292c481748a02347c34df9b1b66552c
font_01_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 10228 bytes
SHA-256: 1fdb360a23583465372d9b9533e99d46c60c86bc8517c0d19712e1358628807f

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