Malicious PDF — malware analysis report

Static analysis result for SHA-256 975fa6543c5ad806…

MALICIOUS

PDF

78.7 KB Created: 2021-03-28 10:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8f6d94a55caa6424a607e99bf970bf63 SHA-1: ecc4a702d2f1ad4ae2662d2510bab7e40a0b2b61 SHA-256: 975fa6543c5ad806553015275dd26afffebafdf877fb37356088e119c7d2bb00
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and is flagged by multiple heuristics as malicious, including a critical rating for linking to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a calendar template, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://yafferge.ru/123?utm_term=draw+so+cute+2019+calendar+template In PDF document text
    • https://madaremowigefin.weebly.com/uploads/1/3/2/6/132681361/bd20e85acb3a5a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_60268f537fac1.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/5CePzjb/mifuvarazanoz.pdfIn PDF document text
    • http://mesugowogidevik.iblogger.org/hummel_trumpet_concerto_sheet_music.pdfIn PDF document text
    • https://bigadamedoje.weebly.com/uploads/1/3/1/3/131384249/diwoleve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409122/normal_60387e10e0747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_60120b8723ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461245/normal_6052a1a82e80e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_600a436bbbd44.pdfIn PDF document text
    • http://lemixebu.22web.org/acceptance_letter_template_for_contract.pdfIn PDF document text
    • http://toselarasomax.iblogger.org/aws_certified_solutions_architect_associate_syllabus.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/MojaBgi/stylish_fonts_apk_uptodown.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/bedtime_stories_for_toddlers_podcast.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/h8ifjh9/85843222893.pdfIn PDF document text
    • http://buzevuzelape.mywebcommunity.org/raag_bilawal_notation.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/john_deere_265_parts_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/RRhh7jh/check_apple_messages_online.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/cartography_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8a1f3dde-ff03-4229-8df0-c5a3ee14905f/how_the_grinch_stole_christmas_cast_teacher.pdfIn PDF document text
    • http://dinaxeziva.rf.gd/the_four_caliphs_of_islam.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/how_to_reset_bosch_500_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af930455-424c-4792-90d9-3755e610f9de/ti-89_titanium_calculator_not_turning_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83976900-21ac-47d9-abd6-ed092d458a6e/xidawumerasuxin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f0a7204-d2e7-4eaa-8690-4114644b043f/is_nancy_drew_coming_back_for_season_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc30eb4-ed42-4980-a5b7-aec16b2547ed/1937120635.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_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 5624 bytes
SHA-256: cf88f9283f776a7a165576c4b179922506b841b7a702d8473660075e13e3272f
font_01_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 10180 bytes
SHA-256: 60ca2896d53db85951eeb75ab51b1ced79f4aa4f3b11370f9ed2c2075eff9582
font_02_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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