Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82fa739e7da9865…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 17:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f496d047dd5cf8ceb014fe13411d3d6 SHA-1: 7f847276c89945bf543825583088a3e0d0680be9 SHA-256: a82fa739e7da9865121613a8e4216a2245fa17a85ca9f33b50af0b4f826391fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF viewers or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spamming campaign aimed at driving traffic to potentially malicious sites. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.jokilaaksonratsastajat.fi/file/22065389627.pdf In PDF document text
    • http://scarpatti.com/files/45681643327.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/tesesen.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/79357708156.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/batigakaboridiw.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/2634150108.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/74908550971.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/69569295131.pdfIn PDF document text
    • http://sooclose.eu/upload/File/92623879375.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302cd0f30f7---95241993398.pdfIn PDF document text
    • http://myslizdrave.com/soubory/39803090280.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/35807231272.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/39600284235.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/wenakirusemitigulurakasat.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/11011910295.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/juvugimudepat.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/42355435187.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/34335782903.pdfIn PDF document text
    • http://myslizdrave.com/soubory/muzolopotilowesep.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/53733791410.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/tefejalofir.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/13183487725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+programming+mcq+with+answersPDF link annotation
    • https://mediaget.com/userfiles/files/6806059752.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_off0000d5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 18212 bytes
SHA-256: 3f8b338a1d0f19f766d68434773779b14bd6544af1f327fa206ef400af6c24ff
font_01_sfnt_off00010536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 11128 bytes
SHA-256: e989441276f923bd676c4645f79181661739fff2c0cdb8d496a4e20c7d5329bc
font_02_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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