Malicious PDF — malware analysis report

Static analysis result for SHA-256 763f24ff1dfdfb07…

MALICIOUS

PDF

68.2 KB Created: 2021-09-12 07:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 899d4f6187aa113cd011bb819923f46c SHA-1: f42cb8ca02019c619fa254b76aa93986e1656300 SHA-256: 763f24ff1dfdfb072475e64cbb50a818b7b5415e4e7553b1bc707699050be71c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a click-outward action, typical for redirecting users to attacker-controlled URLs. Numerous embedded URLs were found, suggesting a link farm or redirection mechanism to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://philabc.ru/uplcv?utm_term=see+private+instagram+stories+anonymously PDF link annotation
    • https://n-zvuk.ru/upload/file/repumigufilupabebolil.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/juxajibelevipenodep.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/14957437647.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/65724753947.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091001070897.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/fijugu.pdfIn PDF document text
    • https://produse-zilan.ro/files/90188804552.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/fawovovowenokavexadawe.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/sexegudagokodotarulagize.pdfIn PDF document text
    • https://hobbypet.cz/files/file/witipadurulosasifusovedig.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/tazafiguwoxu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613610b15a7a2---84845979619.pdfIn PDF document text
    • http://twilaw.com/files/files/8881756355.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/37696893113.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/vojinumajisexafib.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/24372458522.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/28382243199.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/68419005841.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/menefa.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/zimuwelape.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/60260729472.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/92498499859.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/29317300521.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_off0000af9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9E 13856 bytes
SHA-256: 072dc5c1ed190a13feac0a492dc2545095c005b97493277f52ef445a42f2452f
font_01_sfnt_off0000d173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 10952 bytes
SHA-256: 5d7dc16c7217ea8b1e59d48d950a10d2c01cda628d607a7979d60ed784eb558f

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