Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c05fc5913f7bf5…

MALICIOUS

PDF

87.0 KB Created: 2021-09-12 21:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01efb24a788a7ebcd2ca478c0f44b412 SHA-1: 1c4564157e8f60fe256015c5593af64a358401b2 SHA-256: a7c05fc5913f7bf58ec2cf6ac3dcac61f29c347f7ddbeadc137de509e2241d71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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 http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613714bbbae3a---nopirevinadurirozibajir.pdf In PDF document text
    • https://0286869143.com/editor_images/files/xotelovesilitefetifir.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/88881628760.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/jibizipuwawa.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/10494809164.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109061835315334.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/jolekojepepodofagilej.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8c905bf00df6b7124bafb96b904a4e64/13536478444.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/44799662565.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/81478310291.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1541566886613ce65d6b322.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/88701308654.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/72937980310.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/58766272532.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/32129026757.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/95838425549.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/19141500554.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4e741832ce89adf4ae54e40f6dbb7cb1/69989979042.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/39160439933.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/xopasememit.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/11816508254.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/98347264727.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/90562246383.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/bimegulefiwemisavuxofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=samurai+ii+vengeance+game+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 24364 bytes
SHA-256: fdc9dde159a751721327fed334a3606adb3153583cddf242e3ecefdedd77730e
font_01_sfnt_off00011472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7F 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_03_sfnt_off00013527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13527 10772 bytes
SHA-256: 31c0ea930470462e6dc0afcb24c452f0186a5ee0e1d298d1ab2e827d1801623c