Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b120b4012fe4c10…

MALICIOUS

PDF

73.5 KB Created: 2021-09-28 12:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18b6ac7256ccd4a2e4597da5e0d3bbe2 SHA-1: 1a59170a4501e9a607832be4fdd01c99a23db02c SHA-256: 1b120b4012fe4c10bba2c64ae256024324a8d31a82002e1e1f161c01b5adc3e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=avatar+nds+rom PDF link annotation
    • http://checopharma.com/upload/files/sifoweloremadumedu.pdfIn PDF document text
    • http://retailcop.ca/files/xasibagojoboteninirawifek.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/nunedosuruxavizakixawowed.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/94306144478.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/rewosiposanozuzixamemilu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161439386a958d---betafomolasokogepojep.pdfIn PDF document text
    • http://live-net.it/file/xajadadubadelawik.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/79673853678.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/90591256972.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210905032409.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/62354898641.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/putawabovawofut.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/vadifes.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/75120729536.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/safafuloxaj.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/42468565453.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/dowuvo.pdfIn PDF document text
    • http://snsi.jp/image/news_file/biruvipigisederegug.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/29885791333.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/72145264988.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/wimudexudajesojeg.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/lixafasepesafos.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/kawijamukogamuzexidizow.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/sidapuvejorinewusadep.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa798d574d---52798189809.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_off0000b905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB905 10188 bytes
SHA-256: d3d3a3b1bdd750e31964d9179f76c257ca210bcded661588671ce65c2b787031
font_01_sfnt_off0000cfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD6 18948 bytes
SHA-256: 64e103f5cca4ba99b822507fd1883fd8fa8190b4f6c404c7d95902f652e3fcd3
font_02_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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