Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a26bd1ac28799f…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 11:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b3a9cdbb64e011e90c2724d26dfb1e6 SHA-1: ab90bc8fa75b41683a8de2e9adcb74f15716e594 SHA-256: 37a26bd1ac28799faea11fff8d0ecfffb3f97dd6bf03822e5654807e40b61919
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=download+chris+brown+little+more PDF link annotation
    • http://suvenirzp.com/uploads/files/74409303781.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/8884039742.pdfIn PDF document text
    • http://artospace.com/pics/file/32930385989.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/regikiledotorojawisuk.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e93e4410e---53244450687.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/ranevomarurixudezeb.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/lawetonimavofojojebonov.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/bugezexokinazuron.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/45936917731.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/93289746566.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/78737950644.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/41973984317.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/zatum.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/43785669101.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/34035591058.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/92341159623.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/43209434879.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/gagonusaf.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/869d7cd09aea66db947243ca09605111/93470257228.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/46626293756.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/8815897081.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/dabukemilulebin.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/47015483085.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/96597701878.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_off0000c86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 10864 bytes
SHA-256: f72dfeb54ec96a29f170cb3744b29ba2058f1956e5debfbc2716069637a0f6bd
font_01_sfnt_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 17812 bytes
SHA-256: 06dc073d5b6f3d5284743fab6027f5b362f89a259ea3620947e49abf9369f679

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