Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53f75891643afc0…

MALICIOUS

PDF

83.9 KB Created: 2021-10-12 17:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e81bd46056cdca13d0cb80aa47854900 SHA-1: 5daf4ff17a65cc11ab841753b8b8457e70388d21 SHA-256: d53f75891643afc07ee05f2a9924f7d46a9a7217ecb6f4bb22d9be2645fb0691
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The PDF structure and embedded URIs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://medvor.ru/uplcv?utm_term=coppola+francis+ford PDF link annotation
    • http://wakabaeducation.com/userfiles/file/fezeromorejugepiguruligez.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/75135280212.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/4650051441.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///76124970527.pdfIn PDF document text
    • http://uchid.com/uploads/file/19991166156.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/90714850301.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-5/20210905023523230408.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/mimilifuxubusili.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/19962224381.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/vuvapotadusarozejobokinuz.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/wikixujijarasowenoxo.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/gasedimanozofefefupiz.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/37044975337.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/82818964232.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/76377585075.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/fazozimezobofebisujilen.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/89878899526.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/zirusatebibu.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/51041091387.pdfIn PDF document text
    • https://cogi.sed-hut.pl///files//editor/file/29802076513.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/43135211782.pdfIn PDF document text
    • http://autodilygood.cz/files/file/80862156470.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/pilukivulira.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_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 18688 bytes
SHA-256: c7dc8bc5306152cc69a9702bfac93834ab47d287c8deb445965670a422f6d0e8
font_01_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 10416 bytes
SHA-256: 7a032ff312b8a44719070e0491a575a091893335fa4a33e6ca4f5363f4641426
font_02_sfnt_off000129c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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