Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf277aa32764a700…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 03:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ebffd96b5d64ede5bb51a77a643ec5a SHA-1: 11002cdac4fa846e463006640d56222b96dc3f23 SHA-256: bf277aa32764a7009ff59fd16d06817a1de7f61e455bffd4791731943d039939
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 external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=reface+app+video+maker PDF link annotation
    • http://gr-chem.com/upload/files/43642362117.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/30994782847.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/gokegukuxufenuk.pdfIn PDF document text
    • https://kermanrooz.com/img/files/bujopezafobanizofigero.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/36613927929.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/70673934468.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/gifujasetulu.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/lugid.pdfIn PDF document text
    • https://aksusu.com/upload/files/vidojabafoteb.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/figiti.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/73607131452.pdfIn PDF document text
    • http://biosite.ru/images/news/file/vilitisamazisukek.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/zepixevakiredekovagan.pdfIn PDF document text
    • http://rafaelokazakov.com/file/lubetudufexeni.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/duseb.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/74319153518.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/bumanoketapowolojadetud.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/josefetivesavuzup.pdfIn PDF document text
    • http://finchamauto.com/pics/49604731374.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/2424555744.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/49939629259.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/290438ea08f57f5e1ea0a956074b757c/6185480925.pdfIn PDF document text
    • https://mmszke.hu/files/file/94095147573.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/patolopefevudebutu.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/8509483219.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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 19240 bytes
SHA-256: 4dcd448d1a96a9a9bea9d63ec45171d1a2f031602ce61dc9a066e571c38dd079
font_02_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 10568 bytes
SHA-256: 1abe91163f966c354d9675103c9ae6cdf18e01188adbf89b1983428cf5bdff16

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