Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05329d1a8cdc015…

MALICIOUS

PDF

74.5 KB Created: 2021-04-07 04:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4b4db6b47605c99e70290e1babf98f84 SHA-1: cb777a6657c825be0f5b35c55d4d984b5907b48f SHA-256: f05329d1a8cdc015ce3b5d34cf9a658461d18742689083bc911f94d8baf7a1ea
196 Risk Score

Malware Insights

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

The PDF contains a mass external link farm and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document's content is designed to trick users into believing there are new or changed bank instructions. The presence of numerous external links, many with numeric slugs, suggests a phishing or scam campaign aimed at redirecting users to malicious sites.

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 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://druttle.ru/award?keyword=esic+maternity+leave+form+pdf PDF link annotation
    • https://cdn.sqhk.co/wugoselubiki/heiboCz/41367710508.pdfIn PDF document text
    • https://cdn.sqhk.co/vimanagadu/uzPig8p/losopewuzoxatuk.pdfIn PDF document text
    • https://sesirolomozanu.weebly.com/uploads/1/3/2/7/132741009/7879784.pdfIn PDF document text
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/2797246634dc.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/cjccige/scenery_definition_theatre.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/Wjeshdi/terminator_dark_fate_full_movie_english_sub.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/icGnz5E/36843475478.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/xuZHhcg/doletunezogezezokike.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/ihjq8gf/68911418225.pdfIn PDF document text
    • https://cdn.sqhk.co/latusetime/ijbijfq/83945331205.pdfIn PDF document text
    • https://fojakejozu.weebly.com/uploads/1/3/2/7/132712415/9da52fa27.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/egeijMs/commuter_car_for_sale_by_owner.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/IhgNhiN/aa_international_flight_boarding_time.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/putelekireza/zao_shang_hao_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d3a7c9c-07ee-44bb-bdf4-5b6775c6f508/7149545802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c5468f-cef8-428d-9afd-e6de0b1fe853/why_is_my_fridge_freezer_not_cold_enough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655432f2-0d53-4038-a912-2e05f23cf27c/coraline_book_review_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/computer_network_engineer_certificate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ebe8a9-2d1e-4ab7-9af8-b2e2d61e015e/washington_state_football_coaching_staff.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_off0000e54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54C 5420 bytes
SHA-256: 8ea2b9f69af1316ab43f683835014e52223a46fe7c42ff3871a783fb48ea0586
font_01_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 10412 bytes
SHA-256: fe5b30b481e108c09f12c66ad2e6b4955052218950f844a59f0b7d838f8e6211

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