Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf5c9079fbef835…

MALICIOUS

PDF

69.6 KB Created: 2021-04-07 11:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e1707ae538a652598d472c2bf6c81a99 SHA-1: 20206d38e70be54bd5b783b278c498da86b01a37 SHA-256: bbf5c9079fbef835a23f53e533c350dbb1f3a9d27984efd5140d903903c2cef7
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to educational content, likely to trick users into clicking the malicious link.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=surface+area+of+rectangular+prism+worksheet+doc In PDF document text
    • https://cdn.sqhk.co/kigimole/bggA8jc/hacker_simulator_tycoon_online.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/CpmNhaq/bad_religion_tiny_voices_chords.pdfIn PDF document text
    • http://buloshnaya.site/vpn_app_free_for_macxvmfr.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/biahgig/puroxavu.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/IighaWw/ludokotefujirode.pdfIn PDF document text
    • http://tigesonepovar.66ghz.com/88779876672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_604496517d287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_605323cfe1f1a.pdfIn PDF document text
    • http://huseyincanx.com/87323041456jebv1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5fe75a1b3ec1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_60242fd102f3e.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/zoweseriwuritesunepipzrv69.pdfIn PDF document text
    • http://new-leggins.site/viper_remote_start_error_manual_transmissione9t6s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/dulilixuneduzor.pdfIn PDF document text
    • http://bujepefu.epizy.com/camp_chef_wood_pellet_grill_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a2e2cc-515e-40de-8a6a-f89329d17298/49453984947.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/cambridge_first_certificate_handbook_with_answers.pdfIn PDF document text
    • http://lekinip.epizy.com/expresiones_utiles_en_ingles.pdfIn PDF document text
    • http://zazigaxurude.epizy.com/active_tcl_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/dagannoth_kings_trio_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24db67d5-3103-4ff1-800c-d6f28fdbffac/vazowateranel.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_off0000ce9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 5828 bytes
SHA-256: d3397ddbef57639f5b231a8ca3155e9c87c68669b29657042ad0ffd4eb77c0b6
font_01_sfnt_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 10880 bytes
SHA-256: 2974e315ff0c2ee55e0714446af9c92c71e4b740b685d48dc2763ef0945f0e2c

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