Malicious PDF — malware analysis report

Static analysis result for SHA-256 802ac58d16a6ad90…

MALICIOUS

PDF

80.1 KB Created: 2021-03-24 11:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ba48d4fddc0d430f878b0bf003ee874d SHA-1: bec705a9d7c5f263612d89979cf1b1079b07a3f9 SHA-256: 802ac58d16a6ad90e2e9eeb258c43521a6766fb3680ac21fe2493e88b9402461
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with at least one, 'https://leonvi.ru/123?utm_term=toronto+fun+guide+sign+in', appearing to be part of a link farm designed to redirect users. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pretext, aiming to trick users into visiting malicious sites or potentially downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/123?utm_term=toronto+fun+guide+sign+in PDF link annotation
    • http://getakabawi.22web.org/wosozeka.pdfIn PDF document text
    • http://halfraire.xyz/essential_oils_quick_reference_tool_8th_edition_2019_full_colornla66.pdfIn PDF document text
    • http://uspex22.online/philips_at610_aquatouch_shaver_bladeswzpzh.pdfIn PDF document text
    • http://gakesatigefa.22web.org/25273057110.pdfIn PDF document text
    • http://dubupatixekun.iblogger.org/sen_songs_malayalam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenuduximowub.epizy.com/guidelines_for_conducting_a_business_meeting.pdfIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_a01b81a9671c4002a1254f59eeb103ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/is_counting_by_sevens_a_movie.pdfIn PDF document text
    • http://zubeleboju.epizy.com/ignou_sc_st_free_admission_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae68694-b7a2-4345-b451-837934bbbdb0/94021216872.pdfIn PDF document text
    • http://bekawaxag.rf.gd/aptitude_test_questions_and_answers_computer_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc997ed0-dfb8-4665-8903-810c8682aaf5/zutabivoxi.pdfIn PDF document text
    • http://ruxofepugoloma.rf.gd/cheap_formal_dress_shops_melbourne.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_ed5f7425a5b84c5fa43677a083dccb9c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/les_miserables_2019_watch_online_uk.pdfIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_5899cf103a1f46ddb6e90592dd3b3e5b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/does_the_jitterbug_flip_phone_have_an_alarm_clock.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_7af230d9008f4775a522dad2add925d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitatotol/spacerail_level_1_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3828655-19b6-4674-9e85-5b2aa9b75265/powerflex_755_programming_software.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_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 4780 bytes
SHA-256: edd2ffcbe1b4e72ea55ce6ac972e8225dfdf2f053da4193608f4bf94d45d5e8d
font_01_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 11372 bytes
SHA-256: 0478208c0639dbde74448c3f951900a9013bd099678dd6af317749e8237a6786