Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5402253c8015c1…

MALICIOUS

PDF

77.4 KB Created: 2021-09-09 10:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4c1f660821f072638e673ab2a178447 SHA-1: 76160a6856574c399d4d2dc1aa3948b96e2f48f1 SHA-256: da5402253c8015c186b00c0dd30eeffaa47acd524ff08857432f96af01ace173
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains a large number of links pointing to potentially disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pristineleather.com/userfiles/file/29590509791.pdf In PDF document text
    • https://ego-sofa.tw/uploads/files/202108311935452464.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210906085022.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/xajuxulul.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/wamap.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/luvilapuretonadexa.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/16082976487.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/pubolosom.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/71906950162.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/toxopa.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/zorojadamufajivabopu.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/99921479927.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/zetuwi.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/fabogexu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/17528135174.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/30600600431.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131099cbc5df---vabakaxawilowojob.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/51800364164.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/luzaruni.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/64506885537.pdfIn PDF document text
    • https://anaksemut.com/contents/files/lejenigat.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/44065703385.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/87088223298.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/woxaradopekarovosodunolim.pdfIn PDF document text
    • http://na3.it/misc/file/27502348936.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/xudujugonokaxijirag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=speakout+starter+2nd+edition+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 10832 bytes
SHA-256: 642030f548811d389b18d37e45f2eed6f435428c0c8f0bd0ee0354ae34a1d590
font_02_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 17344 bytes
SHA-256: c33e26dbaba810e47e279db9194ef321ab3ea8872be1e17970038e2611dd58ad