Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6304abb70d7c50…

MALICIOUS

PDF

97.6 KB Created: 2021-09-09 02:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: edb3ee6d23ddd59b02cf4634ce5f290f SHA-1: 657239c278077169c4c4c22c008bf63ea077b10e SHA-256: 4e6304abb70d7c50f14025f9f582a607724779bfbddc8babd9e38c99951decda
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://prolocolidodisavio.org/ckfinder/userfiles/files/susavonujapadiwigero.pdf In PDF document text
    • http://chatyzvule.cz/uploads/sakefebowazozisotokudaje.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/69123243127.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/97372251721.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/gaxuzunibixolav.pdfIn PDF document text
    • http://greenglobepms.com/uploads/93438652881.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/tuwulogavif.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/76822610582.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/35757373841.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/wusikok.pdfIn PDF document text
    • http://snft.ro/media/file/finonekinifafegota.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/motewujuvixaz.pdfIn PDF document text
    • https://virker-ikke.dk/files/78696088764.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/33353869378.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/gilusoki.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/kilogatid.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/wewofosogulekukawaxej.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/ligitukilar.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/loloviroluxesurerojexezep.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/zikuxikunisijofuv.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/47515979956.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161358d447fa34---wawonilowujozuvuzike.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/12537914532.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/gojoxuwexitumuluzogu.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/bewapuparudibivir.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/41197178520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+free+anime+apps+for+androidPDF link annotation
    • 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_off00011990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 10664 bytes
SHA-256: 47ef31de25a264e4f30f3f4e48290bb81949e3f1e4feb0608cc60f27f76da1c2
font_01_sfnt_off000131fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FC 18028 bytes
SHA-256: f024ad51be91f632903a2d331774c9eb4ca29b9a565f9c82e793cad68100f40d
font_02_sfnt_off000160ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1