Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bf097666daeb96…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 02:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6d34ab162e2eb72714bee53ea1502989 SHA-1: 8b418852b64b9c035dc98010b4f03e299cca7d52 SHA-256: c2bf097666daeb9697cababf6c3dea35a5e23d198d81243f8223d8f87e6196d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=best+offline+manga+reader+for+android PDF link annotation
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/30141227391.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/23480977034.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/12260905194.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/82856387074.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/zudegegopomawudobupi.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/bifuvotekasidukubudar.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109101959373323.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/rakuvej.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/4652243275.pdfIn PDF document text
    • http://njxinbell.com/upload/files/45691894634.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/peruvelezevi.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/14498320753.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/ludobariwoware.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321728d2ffb---wejetafisu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161328abfe1c7b---makotugawisizitubumozel.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/lodox.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/sepefoselizojig.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/53679829499.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/belixoxedemida.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210909_0D190F21826686BE.pdfIn PDF document text
    • http://unseretochter.ch/images/file/kikuputedimaxev.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/pidupot.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_off0000d591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD591 18288 bytes
SHA-256: de2b09b4c9f4460f50d63118093f1c6aeb362569483089c4b3fbac06b4c7af53
font_01_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 10752 bytes
SHA-256: 62f4c6d18b0385ebf576bf0479ecde05103a01db0ae1c960f07344c075baa552

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