Malicious PDF — malware analysis report

Static analysis result for SHA-256 36378fdb4ed7e1d4…

MALICIOUS

PDF

76.3 KB Created: 2021-03-05 03:19:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 38d22037b94126f2ef7996d6d5a6c757 SHA-1: 94b86d65bbcbc25150b0c6578ee414ec3ea55e2a SHA-256: 36378fdb4ed7e1d47882b903f4f38b8b89ef96a85ecb7e640effb4f0ebe31617
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to academic material, likely a lure to disguise the malicious intent. No scripts were extracted, but the presence of multiple external URIs and the overall structure strongly suggest a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8610

Heuristics 4

  • 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
  • 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://nipisod.ru/award?keyword=bergman+fundamentals+of+heat+and+mass+transfer+8e+solutions PDF link annotation
    • https://cdn.sqhk.co/moturalogupe/UWLvhan/fifabezefizegasizomop.pdfIn PDF document text
    • https://vimavopama.weebly.com/uploads/1/3/4/7/134769365/00019a693c25c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476939/normal_5ffbba520ce5d.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/5400203004.pdfIn PDF document text
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/jexuvododasaj-neximodugekerar.pdfIn PDF document text
    • https://wonumajogo.weebly.com/uploads/1/3/1/3/131379434/tijowidu-jitezusejoz-zolafo.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/cqjcxhb/pixel_car_racer_lt5_1_mile_tune.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/dzhjici/74441485774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477916/normal_602e0200b508c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417669/normal_5fc7f156269cc.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/bLiehjJ/download_rpg_fernz_gate_premium_mod_apk.pdfIn PDF document text
    • https://marajivo.weebly.com/uploads/1/3/4/8/134878422/sonijuwazufudamijo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378604/normal_5fcabf0f3a7c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369487/normal_5fc8325472e13.pdfIn PDF document text
    • https://cdn.sqhk.co/mapuvokunoj/ksjchcF/zidinumubekitikojaxizifef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3326349-58b0-40df-aa64-a8e552f704e0/how_do_i_check_reading_level_in_word.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/gaxiriwexusufajavemilug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f3e30b-e45c-4625-a074-a20f44441fde/rupipowadatunugi.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/midsummer_nights_dream_symbolism.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_6dd4b21100dc40d18e8b56a9985c14bf.pdf?index=trueIn PDF document text
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_a2f3d2057594475c9c37c8d721be2862.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee298e3f-aed5-4739-9c0c-4c90d2159251/sap_query_tutorial.pdfIn 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_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 5564 bytes
SHA-256: 1de8d67d5ae3962dff2418199a70b367c644eb34c29ee874527870566c266943
font_01_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 10528 bytes
SHA-256: 9662ad480d3e5e9bfc537f794c213191b6ba996cf9e8a894ac31ccb9a606674a

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