Malicious PDF — malware analysis report

Static analysis result for SHA-256 de71909719e26bfb…

MALICIOUS

PDF

73.1 KB Created: 2021-09-30 13:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4f65b159f23d7e0149bb87564a303704 SHA-1: c50801f17a8d82fd6ba7f1094ef3ca870dd70347 SHA-256: de71909719e26bfb8a3ea400d959e125d5f9de697c278fe5704b77d1756e2e08
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on disposable domains, a common tactic for link farms designed to evade detection. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this behavior. Additionally, the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document may be instructing the user to open a password-protected archive, a method to hide malicious content from initial scanning. While no scripts were directly extracted, the presence of external links and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://goang-hann.com/uploads/files/202109120601098761.pdf In PDF document text
    • http://imssp.by/data/images/fxeditor/file/nafesevawinegojudewaxonup.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/44665592033.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/87657506346.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/tokogusogixatakizatu.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/50308043248.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/xikatunawomigonarexopetom.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210912062328018595595fob08covw.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/46974162443.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/gewav.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161428973e0c17---voputitixat.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/fikepajigi.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/97653389930.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091613383110.pdfIn PDF document text
    • http://tlca.com/Content/uploads/files/rofebuposigogaruzagiwuf.pdfIn PDF document text
    • http://grandfiltr.com/files/file/49584403679.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/69036362670.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-16/20210916035312830875.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/bibufobepolorafejez.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/63393884367.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630544615.pdfIn PDF document text
    • http://snsi.jp/image/news_file/26192371070.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/45597576087.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/18736277329.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/50255102965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=does+iwatch+work+with+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_off0000b5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D8 18700 bytes
SHA-256: 43bc752f78a591fff3cabd3fc435483f918d8ed13f147ccd24f5189bf358d9eb
font_01_sfnt_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 10600 bytes
SHA-256: 7dc0810e56866b7245107e6a950d5fb5859a24543be9078a97084358a513a840

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