Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3c38f6afcb3538…

MALICIOUS

PDF

70.3 KB Created: 2021-02-26 21:35:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 92b48b0c2d8ed645a72152a425047c39 SHA-1: 0425c35482f8df9c72d791276eaeec30196d3575 SHA-256: 3e3c38f6afcb3538a63f8dd7355a57103e424dcebf82afb463bc4ccd680bb660
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the presence of external links and the overall structure strongly suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/award?keyword=can+you+connect+turtle+beach+stealth+600+to+pc+without+adapter PDF link annotation
    • http://xuwuvewisin.mypressonline.com/topupemudifovetuzarig.pdfIn PDF document text
    • https://cdn.sqhk.co/mapiwoda/wT5jagi/sample_music_mp3_file_download.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/starbucks_mocha_frappuccino_calories_uk.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/how_the_grinch_stole_christmas_1966_tv_tropes.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/maytag_bravos_xl_heating_element_replacement.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/samsung_grand_prime_motherboard_price_in_india.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/why_does_my_samsung_tv_keep_shutting_off.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402963/normal_5ffa148be6cf6.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/nursing_diagnosis_book_apa_citation.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/70957407662.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/shadowrun_20th_anniversary_adventure.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/how_to_do_the_aa_12_steps.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejimafalun.onlinewebshop.net/statistics_tutorial_for_beginners_netbeans.pdfIn PDF document text
    • http://dirojuriju.epizy.com/pajazosujakefumad.pdfIn PDF document text
    • http://zazisuj.epizy.com/whirlpool_dryer_repair_manual.pdfIn PDF document text
    • http://xajuvezovaguze.rf.gd/jarowoporizowobaxusomurum.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_off0000d420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 5696 bytes
SHA-256: 84083dd074f6749e2089f3417f594645bb86decb808dede78561095a6844da45
font_01_sfnt_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 10644 bytes
SHA-256: ff1829afde4343ed97b1c84d5ab9761d82aff4d02e0863b99463d3c3637f523b

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