Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d67006b380fadfb…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 17:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b5962b290b2d10e567413c5cd69cba1 SHA-1: 35afab44c262ea809f7238605039eab87c2be5d9 SHA-256: 5d67006b380fadfbc55e6e869af8eacbd73b7caebdbe997ae90c01d9610ed8e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure strongly suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://oniceh.ru/uplcv?utm_term=f2p+friendly+games PDF link annotation
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d446044097153bd1bef90e945b1e1d99/6925704429.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/bolodof.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/88083603624.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/dopupizoditoso.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/2281529541.pdfIn PDF document text
    • http://scsychem.com/upload/files/gadonixi.pdfIn PDF document text
    • http://robbes.nl/media/files/kigagapigobafafor.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/40861526904.pdfIn PDF document text
    • http://pb-book.com/user_file/file/wipumegipefukizukowubom.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/49543663883.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/fibovasewekoratepuvevum.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/regifavewitivawusiwinef.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/46610891206.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/95356230184.pdfIn PDF document text
    • http://riph.pl/userfiles/file/rufubaloxeve.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/lilajopotaparowilaxanede.pdfIn PDF document text
    • http://malifer.hu/upload/file/mawavaw.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/tutomutudomegi.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/27131573411.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/ginina.pdfIn PDF document text
    • http://belovosushi.ru/files/54067600113.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/30975140040.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/panavofejowudik.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001010e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010E 18008 bytes
SHA-256: b6bbf2e5e8b7670109a161aabd3903acc07ae1572f8a7dd68ca970268ae25914
font_02_sfnt_off0001301e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301E 10832 bytes
SHA-256: 89241f18830c17701a880806267a31bd6ad6460588f38424541b3ff72d3a4f60

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