Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f5c2c831604683…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 20:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2744cb6b9d62bbeef44b7665d6c71784 SHA-1: 660e3311264459252c0008ee284dc22379a62343 SHA-256: 65f5c2c831604683aec7dc3848da1bbc9bf594938d4a870e4f16ae8c02945e56
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 or trojan. It contains a large number of embedded URLs, many of which are on disposable hosting and utilize UTM parameters, indicating a likely phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF acts as a link farm to obscure the true malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://chcial.ru/uplcv?utm_term=roblox+hack+robux+happymod PDF link annotation
    • https://etimes.mn/uploads/files/pubazazale.pdfIn PDF document text
    • https://coevent.ru/upload/files/fagopunixofaduwufo.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/bitepomedawigefupalinokux.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/75043906480.pdfIn PDF document text
    • http://salespate.com/userfiles/file/bawerukukilopan.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/daxodugagirig.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/mimewimumimufelogenelu.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/gexodenilifit.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/doxugadasomilutijora.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/gepuba.pdfIn PDF document text
    • http://roocenter.ru/upload/file/mewid.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/61298931365.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/10879197563.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/motikasikifapiwegokawo.pdfIn PDF document text
    • http://atrsara.ir/resource/files/51337993587.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/rimatuwuwegisava.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/sejalokup.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/fupafunobanigogugomez.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/kevevamotaraf.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/22783874413.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/pemevonexowoxaxokufaruk.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/tukisovidemusozimamidekex.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/94237699047.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210910_7905A63985AD8D82.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/134697169.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_off0000c3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A6 17120 bytes
SHA-256: 94fa4770ee71fc2a1080513b64baec6bba10446bdf0901cc0d36c9136d171a99
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 10776 bytes
SHA-256: 335b894bf5af655a0bdc2ea9288452c00dbcc98207b50929b5a394f3978e5e5a

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