Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b753af04abca7d2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 11:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 712d83aa8317fe381e961f189d25fdfc SHA-1: 0fdb60217e6cd8acbc7f62fbc51fea40a221cd5e SHA-256: 8b753af04abca7d23a8f2a126926fb2c9af1bce509b344a0d0082dcf7df2ae94
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, many of which are structured as link farms with UTM parameters, suggesting a phishing or credential harvesting campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=mx+linux+dual+boot+windows+10 PDF link annotation
    • https://geneticapanama.com/userfiles/file/30956520605.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/96936508131.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a790354244---43258911107.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/43327488229.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109080753588450.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/27850620951.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109022133061146.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/7396310421.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/kezifovesaxofobulig.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/xopululatogezevezi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/amutnqb8nj61c9usq398il11q1/96204602364.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109031153293297.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/99427702090.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/pesolafokizuturobifomawoj.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/99771851491.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/jinoxevil.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/gasote.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/30482422134.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/devevivezakopapukuzipav.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/25692885806.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/zatadixafezemixido.pdfIn PDF document text
    • https://dom-titan.rs/files/ludog.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/defonifokipizixom.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/movij.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_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 10604 bytes
SHA-256: 9ff2b94df5eab7250c96c56bdb8dc9f0d5176e99ca2fc5545c95a9abe240ed3f
font_01_sfnt_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 18028 bytes
SHA-256: 6ae892e2c8621c2796ee5f9f028d8d52d68ae40b61a3d8fee7d880e5365f4375