Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6de50a083ea5b5…

MALICIOUS

PDF

70.3 KB Created: 2021-09-30 20:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f478bd0f0c30d94aba3bb0450e4f9287 SHA-1: f0c8c6c56bbb96a3cf3973355d0b6f21ad376a06 SHA-256: fe6de50a083ea5b5291277030b3ccd55d24dab5087391fd8054875ccde378598
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF SEO Disposable Link Farm heuristic further supports that this document is part of a scheme to distribute malicious content via numerous disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://serenetour.com/image/upload/File/47045857349.pdf In PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/43566581972.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/69231269190.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/jazitiwakefi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8cfaa1ec1a0dcce2a40f613299592c16/67854318902.pdfIn PDF document text
    • http://7serve.org/userfiles/file/20210920230238.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/xosemamululefukade.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/kidomutufekefiwubadiwuxug.pdfIn PDF document text
    • https://asp2.aiwangyun.com/ckfinder/userfiles/files/luxudotagazubap.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/1984584300.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/25600997052.pdfIn PDF document text
    • https://adikketiga.com/contents/files/miramofovitekizuzilunem.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/75519107041.pdfIn PDF document text
    • http://bushurov.ru/images/files/90900175266.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/5031569067.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/15908515523.pdfIn PDF document text
    • http://rcot.by/pics/files/vosikunuwidalepusevixa.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/boruzivivanezutiw.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/20005995517.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/gipudo.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/zesovojifezofixixevuzuvu.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/riwigibigereporij.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/45162606270.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/46527567171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hill+climb+2+onlinePDF 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_off0000b31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 10116 bytes
SHA-256: 6adfc8dddedd9ef13974af40b419dd420eef815ca8bb86aa724b0f8851b1214f
font_02_sfnt_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 16548 bytes
SHA-256: 3eac5c39fc037777c995dd4de8e85a822e71b04f5257343b4fec424f32356336

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