Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd95961527c96858…

MALICIOUS

PDF

73.6 KB Created: 2021-03-19 02:50:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 43c68d621ad0b8bfae5f38a1f4d02171 SHA-1: d5e80a78e8f847c2507c67f3b6ba27855425e452 SHA-256: dd95961527c968589a79a560ae14bfd729da20aa9fdba21db0821c0f41b14190
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one pointing to 'jumiwimov.ru', suggesting a lure to a potentially malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying the PDF as a link farm hosted on disposable domains, likely to obscure malicious destinations. No scripts were extracted, but the overall structure and URL findings point towards 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://jumiwimov.ru/award?keyword=chinese+to+english+pdf+conversion PDF link annotation
    • https://cdn.sqhk.co/zofagopipowi/WchjUsz/bass_booster_pc_windows_10_gratis.pdfIn PDF document text
    • http://samejeno.iblogger.org/numil.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/c_to_f_chart.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/confirmation_bias_psychology.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/SMSASha/hashtags_for_followers_2020.pdfIn PDF document text
    • http://raraveluwogevuw.mypressonline.com/rsmssb_steno_syllabus_2020.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/vumaworotexu.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/zjczQb3/stickman_master_archer_redeem_code.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/73368651641.pdfIn PDF document text
    • https://cdn.sqhk.co/vizodejo/NLmijhL/bajuwiwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://povuputuk.epizy.com/63530332136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ed2938a-f7e2-4b86-b51f-986fdf48bca6/what_are_the_theatrical_elements_of_a_musical_play.pdfIn PDF document text
    • http://toxisokipefofo.epizy.com/ms_word_templates_certificate_appreciation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21877f13-7a48-4fdf-95d6-a6d6ecf27158/paxufoguwejob.pdfIn PDF document text
    • http://faleferesevo.onlinewebshop.net/50820760917.pdfIn PDF document text
    • http://nogurinuzelajer.rf.gd/29678853082.pdfIn PDF document text
    • http://gilotekovipani.rf.gd/anointing_of_the_holy_spirit_wigglesworth.pdfIn PDF document text
    • http://fafigumo.rf.gd/sasafo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 3688 bytes
SHA-256: d5689c5c6762f9b6306e2c8df03774f7f7781bb6bdcce11d8d944149045f74aa
font_01_sfnt_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 5172 bytes
SHA-256: ed1a9a53170ef66066caba6377272b6c0db6c03d0f2acf1aa2d6a37e029a56a7
font_02_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 10408 bytes
SHA-256: 8d9d71d5ff14278596b67eb86729ad1166fc316b50496f7b9333fb2d20becd4e

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