Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3599214042d302…

MALICIOUS

PDF

78.8 KB Created: 2021-09-12 10:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38016a99a20ada2fb518abe198055e1a SHA-1: 9d787dbd87dacd1c384ab83a464c4d1f9da7fb7e SHA-256: 7a3599214042d302a7d8dbd20b723c45aff4ec1288df09f806cc051618dbf94f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to disposable domains, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://slxiang.com/v15/Upload/file/2021972132597659.pdf In PDF document text
    • http://lacasedescaraibes.fr/file/90789688465.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b211ab8dc---nawememinegula.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/bawotisis.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/nelixurudig.pdfIn PDF document text
    • http://baoveantam.info/upload/files/52624644973.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/16051498622.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/74600173663.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/51051775766.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/bidapom.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/63737286706.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/zupap.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/43652203582.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/nusixeboturiravanidu.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16310435021897129383.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/negugumagakivotumazu.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/mokurukilirobirezimozesip.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/fozuzemulurum.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/pawojemowinozuvotifepuk.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/99660094110.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/63387107211.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/1130809942613da5e298643.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/44959968195.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/viragavaramezetanowij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=open+source+office+softwarePDF 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_off0000d1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BA 10640 bytes
SHA-256: 0ff4331fb2cc65d0a6ff425be1d27a3a7f4bed8c2ab39df7a7bbd48cd8899523
font_01_sfnt_off0000ea55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 16740 bytes
SHA-256: 0e869e242ec915456f22506cf7f582d18edadc592997b2d300a380885fc69d49
font_02_sfnt_off0001158d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1