Malicious PDF — malware analysis report

Static analysis result for SHA-256 e115a7071bd27309…

MALICIOUS

PDF

79.5 KB Created: 2021-09-10 08:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a03d5cb933498c5f90b4ccac091c88fb SHA-1: 681ddc62c2fd5fcd89225a950f846c6da49100bf SHA-256: e115a7071bd27309011cd300c149ad7b6125d9ef57adfc7b251d88d9a6682a0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis revealed a significant number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly imply a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=how+to+move+apps+to+sd+card+on+android+10 PDF link annotation
    • http://forglass.sk/userfiles/file/tudugivixujinez.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/kirabemogamezoge.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/61065446216.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/64714085877.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/71567882087.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/75998696572.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac76c1960c---68865819979.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/50536991946.pdfIn PDF document text
    • https://actorconseil.com/files/file/bogopuse.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/mivofakovubazawifima.pdfIn PDF document text
    • http://jadeite.ru/images/file/tokinozuwabixeguvolevadiz.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/87586831688.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/88679131586.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/80560106430.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/64035233176.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/nazivumipex.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/58911148498.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/77132422465.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/7815450766.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/lemidipalejokilinotan.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/xunederijotatu.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/kitevonepoxopuge.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/98f666026a9a42cd3575c11552090d20/80173733636.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/41550300404.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_off0000d1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D3 10944 bytes
SHA-256: 7200a532e8944cb91417138516145fa9d5a86af0f7fa0a341e8b31990271a8bf
font_02_sfnt_off0001033b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 17424 bytes
SHA-256: 118b599e8411c0ef08370ced966564ed5bb9b7317439b831e02a220ce13339a2