Malicious PDF — malware analysis report

Static analysis result for SHA-256 0621e774dc971dba…

MALICIOUS

PDF

72.7 KB Created: 2021-02-28 22:03:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 04f19d6ca8da9e730ed52b6e99a481dc SHA-1: ec1a5159b8cb40aef79274c2d07364d44075d606 SHA-256: 0621e774dc971dba5f1005e2f9ff87b924be7a1bb108d69ecf575e35c52bc661
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains text related to product attachments and application details, which may serve as a lure.

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://druttle.ru/strik?utm_term=oster+kitchen+center+juicer+attachment PDF link annotation
    • http://zeboxagekej.sportsontheweb.net/1786429782.pdfIn PDF document text
    • http://crysety.xyz/tupapobaguzijiwua88oh.pdfIn PDF document text
    • http://optarfes.com/degawafobavawesopemikudo6ql32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476939/normal_5fc5bb89d6ab7.pdfIn PDF document text
    • http://brandframeb.com/nonejiwexidoragosubipekec4ioz.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/93376470126.pdfIn PDF document text
    • http://girlsbeach.space/pivojigesisicsy2t.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/mini_smart_socket_manual.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/jajig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478398/normal_5fc84cd3867a9.pdfIn PDF document text
    • http://nefritthebestthing.site/wall_street_journal_prime_rate_2019_historytbbgd.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/34238278667.pdfIn PDF document text
    • http://mebelintera.ru/nazezvcpwz.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/36716385767.pdfIn PDF document text
    • http://italy-small.space/cherry_keyboard_switches_typesi8fip.pdfIn PDF document text
    • http://extrameets.fun/what_is_the_meaning_of_english_as_a_second_languagedtusl.pdfIn PDF document text
    • http://kino-vezde.ru/ginanagafb173a.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/vapefutipax.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/60869955405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/tp_link_tl_wr841n_bd_price.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_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 5176 bytes
SHA-256: dd32fcd5983bbf7744f874794b82731602e3467cf26d3c59c1b241e8ee988357
font_01_sfnt_off0000f1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 10304 bytes
SHA-256: a94ecdceb2602a728603a8b9c86695ed0b2121bb01bac6c9b2d247d6cfdfc780

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