Malicious PDF — malware analysis report

Static analysis result for SHA-256 6077fc08b33bfd58…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 11:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07d53ba59efd226ddfeda788709cc957 SHA-1: 144fc4b741bf9bffe0286c4c976e434d56f04e6d SHA-256: 6077fc08b33bfd58494f1abe4ceb3bd51420343117131cdc7e3c365cea14a832
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=where+is+recent+apps+button+android PDF link annotation
    • https://kontiko.com/ktkweb3/images/upload/files/5281634620.pdfIn PDF document text
    • http://elma1.ru/!upload/files/53080613640.pdfIn PDF document text
    • http://slsnn.ru/content/files/xojudomejoveboritosudemig.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/wapenu.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/9323814475.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/rujokizikonutikudaba.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/31246874833.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/bemobetedafedozotazora.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/20762975356.pdfIn PDF document text
    • http://posuni.com/userfiles/file/wumamudeferomedasuvow.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/zixuziluzobejajojaluwom.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/57529769127.pdfIn PDF document text
    • http://partnercable.com/files/21062820536.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/15217206540.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/lurulepobu.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/91628309367.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109100046037536.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/dilobojigiboz.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad48e0298a---55710034004.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/56732749825.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161454fb3f0607---worut.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/36230444475.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/molemoxesiged.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_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 17180 bytes
SHA-256: 76c8e8457ad3cd11663d05551201f3cbc0585d7f653b39ec467824b2b9fd11ab
font_02_sfnt_off00012d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D43 10796 bytes
SHA-256: 78042148bb18694529a666fed1cb42622821380d4e17dfffc95e6f035071153b