Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66c623ab1acba4d…

MALICIOUS

PDF

88.3 KB Created: 2021-03-18 04:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: daf41ca15fdd6d378d7949317776324d SHA-1: b0299893bc0e15db21c7b40c2f8689eb0eea8cca SHA-256: f66c623ab1acba4da9ecb4a2a2c572856020b7621a05e3a75343cda8aac61179
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains multiple heuristics indicating it is a phishing lure, including brand impersonation and links to disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely redirect to a credential harvesting page, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://golakabuzoved.weebly.com/uploads/1/3/4/8/134870140/cd6c38f26a25c.pdf.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=old+school+runescape+void+pure+guide PDF link annotation
    • http://dapajurop.mygamesonline.org/jifulugusek.pdfIn PDF document text
    • https://golakabuzoved.weebly.com/uploads/1/3/4/8/134870140/cd6c38f26a25c.pdfIn PDF document text
    • http://gewututikame.getenjoyment.net/intermediate_english_reading_and_comprehension_book.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/dibuduwapudifizamesikepu4psmz.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/37492767170.pdfIn PDF document text
    • http://fosireditoj.mygamesonline.org/7801060697.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/arthur_c_clarke_books_sinhala_free_download.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/41226411507.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/ihhLhfS/hidden_escape_lost_temple_walkthrough_appunwrapper.pdfIn PDF document text
    • https://rifodajawu.weebly.com/uploads/1/3/0/7/130739776/857ae8f.pdfIn PDF document text
    • http://trysol.xyz/glory_in_death_audiobook_youtube0e7be.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/65776624097.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/ghY9wih/4743648199.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/sejarah_kereta_api_indonesia.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/jejhhft/15052639284.pdfIn PDF document text
    • https://kalogipewaga.weebly.com/uploads/1/3/4/5/134595512/2721887.pdfIn PDF document text
    • https://cdn.sqhk.co/dutararopat/fhfjFMj/microsoft_office_365_sharepoint_tutorial.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/10897108194tvh4j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabodegodonirad.atwebpages.com/three_billy_goats_gruff.pdfIn PDF document text
    • http://raxegujanamefas.atwebpages.com/xaretewegosumopaput.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/why_is_my_lorex_system_beeping.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_off00011bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 5424 bytes
SHA-256: 7e5d85d4a601900a08fa99d079485ae3b9c5993367443b252aa07d8e6b138899
font_01_sfnt_off00012e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E49 11136 bytes
SHA-256: a55e0f30198c27bf1ac8dfca6ac1eeafa2b4c84894d3fc2daaa0cf93f9134db6