Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcc4a252a1d346c…

MALICIOUS

PDF

74.8 KB Created: 2021-04-17 04:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8e2587c8aa2a542ccbd7276cdd7f2194 SHA-1: 477ff11705a369f50c44fe5b6f3ab15297187fdb SHA-256: ddcc4a252a1d346c126e6c9388454d2b83529fa1fcb04c0480214dfb9520e17d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting domains, suggesting a link farm or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of links on disposable hosting, further supporting a malicious intent to redirect users. The primary malicious URL identified is https://dugedepap.ru/strik?utm_term=cliffs+ap+biology+dat.

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://dugedepap.ru/strik?utm_term=cliffs+ap+biology+dat PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473410/normal_604ca021035cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407989/normal_605d4e4780631.pdfIn PDF document text
    • http://paxibokojusaduw.22web.org/57288963577.pdfIn PDF document text
    • http://thelandofbadideas.com/odia_song_2019_neweijp6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_604829541d859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_604fd283b38f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383806/normal_5ff54997b7938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_606e1b1f07f2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_5fdc18dc93d2f.pdfIn PDF document text
    • http://itasummer.fun/witaleiq6ie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409623/normal_605d9ac080eb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zopatirek.epizy.com/refanevapujizajav.pdfIn PDF document text
    • http://nojisibi.rf.gd/korn_and_bash_shell_programming.pdfIn PDF document text
    • http://wekaniloba.rf.gd/12194166727.pdfIn PDF document text
    • http://vutegug.epizy.com/ip_address_personal_information_gdpr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ffc1345-4e1e-431e-a7ef-f69d5a472483/kenmore_90_series_gas_dryer_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6bfdafe-b455-4666-8cc8-c23e1ef42720/91854294063.pdfIn PDF document text
    • http://pisozirepuwi.epizy.com/wuzoxakigotumibuni.pdfIn PDF document text
    • http://dujupopo.epizy.com/guxeligoxuvofomewigaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d4fcc1-c2e3-4d82-9433-4afbec1598a1/narrative_of_the_life_of_frederick_douglass_an_american_slave_chapter_1_summary.pdfIn PDF document text
    • http://nofexezizakizu.rf.gd/71895839998.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_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 5260 bytes
SHA-256: 41e2ca1d142076cb56debdf2886cda39adcde64f180aa11ef2e8bc8fae5100e7
font_01_sfnt_off0000f7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 11208 bytes
SHA-256: 7036df8ab778b0d204128b7efe9b27b146642abce6dd8c6e67b51c5ece48935b

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