Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d836acecf2ee27…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 01:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45bd4749d98ece20c94e7d3a85c00d5b SHA-1: da4d8e81562ed9b93d99df162ae96068d373542e SHA-256: e5d836acecf2ee272e9a095a635a57620418b34b472590edfa30e87d3f069df4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The PDF structure itself is also noted as a link farm, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://wastran.ru/uplcv?utm_term=processor+in+redmi+note+10+pro+max PDF link annotation
    • https://geneolock.com/ckfinder/userfiles/files/13280355317.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/fujipofiwolutu.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/kinage.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/zurufanubupi.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/3030010164.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/gadebivaxabuw.pdfIn PDF document text
    • http://varvshistoriska.com/file/37600376715.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/79948091755.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/mijamekepome.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/27765528379.pdfIn PDF document text
    • http://ridendo.cz/files/file/5270627489.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/30322859023.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/43779735906.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/87238520322.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/rumezoneferomaseb.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/91190959999.pdfIn PDF document text
    • http://www.og2c.com/images/file/26901529871.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/xerepapuxovapokuberibo.pdfIn PDF document text
    • https://bfull.ru/uploads/files/20326983548.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/38575447518.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/85743674650.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd8eea03af---50283844706.pdfIn 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_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 10908 bytes
SHA-256: 6c8e2faec2ceb9f2b5c2a0f76e2c6ace7f3eb964bad369e43d4ca4ce93710a6f
font_01_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 20000 bytes
SHA-256: 2ec1be6878d4faa7f64a2b841d087ca3b560b43fec0cb9d508fd2fb2b0c856f2
font_02_sfnt_off00012f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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