Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcec63d04c8c3c8e…

MALICIOUS

PDF

81.1 KB Created: 2021-04-19 05:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c21cca22444a129e7a604b9702e8a188 SHA-1: ce6f2e373f263ea12c3d10423371516daa775ebd SHA-256: bcec63d04c8c3c8ee83d432cfca94268b3f757d25cceb936ea149875e8af3d1a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains that appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'interior room design games online'. No scripts were extracted, but the presence of multiple external URIs and the overall heuristic profile strongly indicate a phishing or malware distribution attempt.

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://pelibifir.ru/strik?utm_term=interior+room+design+games+online PDF link annotation
    • http://kagaromorin.medianewsonline.com/nazubagifafividaraxapex.pdfIn PDF document text
    • http://juborad.mywebcommunity.org/gusinikatofepetaw.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/agile_pmp.pdfIn PDF document text
    • http://zoomita.space/texas_gdp_vs_russiayoavf.pdfIn PDF document text
    • http://wusator.mygamesonline.org/d_d_5e_character_sheet_generator.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/dugorovetozujujavewiv.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/convert_file_into_word_format.pdfIn PDF document text
    • http://korecos.ru/how_to_get_better_fitness_for_soccerff3nw.pdfIn PDF document text
    • http://degakak.sportsontheweb.net/ethical_dilemma_examples_and_solutions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_196f3bf9d17c4a6398bb3fe42dbcb921.pdf?index=trueIn PDF document text
    • http://kikidexawudipox.epizy.com/bums_in_the_attic.pdfIn PDF document text
    • http://gotazuvibidok.epizy.com/jusazodesu.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_f4fc3b1ff37945939a67c1552f7f3790.pdf?index=trueIn PDF document text
    • http://gagolabirej.atwebpages.com/66747714875.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/what_are_some_of_your_core_values_interview_question.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/train_to_busan_2_movie.pdfIn PDF document text
    • http://mujibise.epizy.com/church_security_team_job_description.pdfIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_609a5b3f7e8e40c6b1c6751c6d9c5b1e.pdf?index=trueIn 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_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 5080 bytes
SHA-256: 4e255d634058fa4ce841bef131acd8b82e1400a74b97285075e7532090a3b28b
font_01_sfnt_off000110ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EF 11112 bytes
SHA-256: bd1f79fff165482f10164e8cf2531d42fb2e9ea7ad0c7997315385fde64532b0

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