Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcc6f6e973f20dd…

MALICIOUS

PDF

79.4 KB Created: 2021-09-09 16:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: fc1869a65045bee8eabb4960498a9307 SHA-1: f4a55c5d7d0dd6ba5c5984b1380f752c7d7b753e SHA-256: 4bcc6f6e973f20ddea7d973bb548fbd8eef80bf2198abc881784ac7108be1333
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 0.9846

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 http://businessdevelopmentcenter.pl/uploads/userfiles/files/45644001783.pdf In PDF document text
    • https://ekoelprom.pl/public/images/editor/file/remuroganulijavemodom.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/jubidofoforizumep.pdfIn PDF document text
    • https://partnermind.cz/images/files/foxunujozefusejad.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/bogutogilitovusejuvidox.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/guxiwotubuwajobawonesubu.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/jobinuz.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/rorodafopon.pdfIn PDF document text
    • http://minerva-collection.net/files/files/tatoxevefoxijomad.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109021246461163.pdfIn PDF document text
    • http://millecolori.it/images/file/48768608515.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/wevemo.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/99891916808.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/xefinurazokolezuwogogi.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/f644e4dd84e8253cdd7d4b740c8b80f2.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/patuwotuxivukepo.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/19554540475.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/8045147434.pdfIn PDF document text
    • http://abc-tel.ru/data/File/susilidekidoba.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf35c8ec5---324093292.pdfIn PDF document text
    • http://npas.ru/pic/file/38706281947.pdfIn PDF document text
    • http://jawarakreasi.com/file/voluforebaboxu.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/40733861806.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/nunodekopatepodebe.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/12578012627.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/vekigujivawelabozivape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+studio+32+bit+windows+7PDF 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_off0000d351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 17040 bytes
SHA-256: 875ce55618fe451504149af35a57f077830f7e3dfd611a9400e8855794f1076b
font_01_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 10552 bytes
SHA-256: 4f527444cd0df0a1d013209271370f3541a6b8139ff5987eb80871d6973a46f2
font_02_sfnt_off000117ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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