Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb8ad0bc2b5f792…

MALICIOUS

PDF

77.9 KB Created: 2021-05-14 15:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fc1169c893d60e3e77b1ae77551fd3ea SHA-1: 65ffaf16ec42979eb469b62d2b84f83e007518ab SHA-256: bfb8ad0bc2b5f7927e10e92b3369f8f28d5505314addf515b222538351c6d1e5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with many pointing to disposable hosting and using UTM parameters, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/strik?utm_term=bright+line+eating+recipes+katie PDF link annotation
    • http://zizoxuviwemaki.iblogger.org/lizizovuxe.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/22428472633lnwra.pdfIn PDF document text
    • http://gravkamen.ru/lipuzefasedusefuwekoziiezt3.pdfIn PDF document text
    • http://rating-bookmaker.ru/8744106540kgfqc.pdfIn PDF document text
    • http://sungo1.space/parts_of_speech_worksheets_with_answers8fyfh.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/fIryiha/hang_glider_accident_in_killeen_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/worijekegir/Khbjfig/free_abacus_worksheets_for_grade_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a17021-a62c-4422-a252-fe995a1f7fa6/20668704270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7185359f-271a-40d6-9d1f-fb85b06ff4fe/eaton_fuller_fault_code_64.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_266e727ab1bf4e44919eb3dd8907ad29.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_bd29878c39b1434b85d1070bfb0abb79.pdf?index=trueIn PDF document text
    • http://rujavesejijoram.epizy.com/jawbone_jambox_wont_pair_with_my_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755eaddd-0a66-4631-8c41-3290dc24ec76/power_pressure_cooker_xl_slow_cooker_lid.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_92aa22f9bcaf4652aff9951870f35f9a.pdf?index=trueIn PDF document text
    • http://golofup.rf.gd/ziwajetov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc07bf67-facb-4404-b83d-80be29c2d538/pride_and_prejudice_book_summary.pdfIn PDF document text
    • http://ludumidajite.rf.gd/53271505960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d48cb29-3a0b-4f77-94a4-2eb4e5c65e08/who_wrote_the_most_famous_beatles_songs.pdfIn PDF document text
    • http://ruredat.rf.gd/business_law_13th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c02fe12-df56-4bad-b7fa-b011d31f9c47/is_infrared_heater_good.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_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 5308 bytes
SHA-256: 18e3d26ed0d472b7a5c3d5a772e145fe22c5cb36d3a2e4cf41972ccf089be5bd
font_01_sfnt_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 12304 bytes
SHA-256: 19cc0cb9797354996b3cbfcd7d488f4da0f2f139bed9c0d7879e7e72acda2b43