Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc804e1606cbc125…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 13:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8ded612ce9bff2c2de4c65d966ba551b SHA-1: 65c3c5587125177534422618fa3e545b5cf2484e SHA-256: bc804e1606cbc1250e165d7b96ddd46a1d76479124e93419fcb306d72ba28eae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains, and one heuristic identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://bjerkelunden.org/content/files/userfiles/file///kajifosojopuwigalinala.pdf In PDF document text
    • https://empresa-venta.hr/files/pobaweveroruditupesez.pdfIn PDF document text
    • http://herve-coiffure.ci/files/sawipugezunuj.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///faxofitekazojeseg.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/15090661901.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/61338007411.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/luburegijinozixavuvopezu.pdfIn PDF document text
    • http://freestyler.cz/img/file/49939383635.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/xofolapematejonirudiz.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/sidumajikalekufexugulo.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/64293983187.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/14174193192.pdfIn PDF document text
    • http://rjt1.org/upload/files/76960710917.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf5f0bcb9---xusiziledupikaduxinum.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/wemerapurinumazenokufotuv.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/vugobipujadojawidixidupe.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/57345735926.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-2/20210902072818950786.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/fupatob.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/87801396966.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/divotax.pdfIn PDF document text
    • http://agama-rc.com/upload/files/nexezowizakagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+send+file+android+to+iphonePDF 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_off0000ae27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE27 10672 bytes
SHA-256: 390a16bbf30c409bb53ccfa3a350822ac9391a9ddd41d19700af00743f774004
font_01_sfnt_off0000c688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC688 15808 bytes
SHA-256: 8d1999be0fc9c4b47129799085b5d495a9305475c08459a9faf816429444a95b
font_02_sfnt_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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