Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b68ff8e21b54652…

MALICIOUS

PDF

83.9 KB Created: 2021-03-01 00:02:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: a93fc3fbe3565d94559629d4efdecfcc SHA-1: 3518e16effae1ddb6ab9897bfbc6f760e50a71f5 SHA-256: 7b68ff8e21b54652ccede406fe4962ca45a5282b67ecf748cfaf5d8d2aa4f48d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://midufefew.ru/123?utm_term=monster+myth+names, is a primary indicator of this activity. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest potential for embedding malicious JavaScript or redirecting to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/123?utm_term=monster+myth+names PDF link annotation
    • https://cdn.sqhk.co/gasubapo/geOFQhf/mozosotivibonozererizudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_6038241e0dcb3.pdfIn PDF document text
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/sabur_xodebiserisago_degetuda_kigexuduxekazev.pdfIn PDF document text
    • https://kasuvimifimo.weebly.com/uploads/1/3/1/6/131637099/vafof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_601a1f10ec8cc.pdfIn PDF document text
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/sevexeborag.pdfIn PDF document text
    • https://xeraxoxatetubus.weebly.com/uploads/1/3/5/9/135993523/narexof.pdfIn PDF document text
    • https://cdn.sqhk.co/vuluzazogur/ggHOjbl/penoxememu.pdfIn PDF document text
    • https://nofuxufemi.weebly.com/uploads/1/3/2/6/132681390/tidozinabej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485172/normal_5fcbe25449eab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_6023045469bf7.pdfIn PDF document text
    • https://cdn.sqhk.co/jesarijufe/fUpjbfX/vimagaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/isjizF0/12244763087.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/1b5a19e8c2cde30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387699/normal_5ff4a5a1d53a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muwalolerede.epizy.com/adalet_aaolu_fikrimin_ince_gl.pdfIn PDF document text
    • http://rexerikilo.epizy.com/day_bangla_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/jubilate_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/21475726791.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/rewelogajuvitejefopuj.pdfIn PDF document text
    • http://funolowudako.epizy.com/battlefield_2_trainer_pc.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://scripts.sil.org/OFLIn 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_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 5000 bytes
SHA-256: cf1608b1beb5c644b1aabbf0456c4e5a596a1b900e8f0f29c69f6a4e7a4c59d6
font_01_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 10964 bytes
SHA-256: 6140d56852f82f72e2f5212909a43f30fffaf03892bbdeb8428ba70835ed0326
font_02_sfnt_off00012c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9F 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501