Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb9ae2b490b0583…

MALICIOUS

PDF

87.5 KB Created: 2021-09-19 18:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c8fb0c67d50f6bfacd37d668214bc015 SHA-1: 8ed7a21fae1690b56c0a071c7b88604f5477ef4e SHA-256: 9bb9ae2b490b0583d153e9b084e7653b6f17dc30c783d4f83db25e1868f993ca
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a high number of embedded URLs, many pointing to disposable domains, consistent with a link farm used for phishing or malware distribution. The presence of QR code lure heuristics further supports a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/dexefe.pdf In PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/vemetemugifuraxafuluguxu.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/84580146399.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/vepilezawimakivetujawez.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/belamimi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9ftbkjuld5ni2utreqgg3bjq86/87259214920.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/jedodogepikonudovarak.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/95932252734.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/jalukezonazigij.pdfIn PDF document text
    • http://dogable.de/userfiles/file/65543188750.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/80184655283.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/67880677910.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/7414788364.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/54751410723.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/wenubujinolexibikejumutu.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/85141931114.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/43653588973.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/fomegadup.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/6l3ac7skf6d1ifg42qjgd0l2ju/99292051283.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/16134132901.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/romadekuti.pdfIn PDF document text
    • http://cmtsport.com/pliki/famidumodevidamofazozed.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/mofujugeledigavokorivite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+know+which+android+version+i+havePDF 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_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 10656 bytes
SHA-256: dbaae1824748cf4bb6498f1a690ca4c34d42643be1bf2dea9f6c00d90507595f
font_01_sfnt_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 17536 bytes
SHA-256: 2ce555e82aa466cb69ad025adbad105d0412f19a87c6b70070a3308ce66f03e3
font_02_sfnt_off000137ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1