Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c15207a2c662d8…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 05:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4db40d4efd211ed9bc3c5d38ea495061 SHA-1: f5ac3e6ce5610a4111ad7eb7cf3fcb49a82c1ec8 SHA-256: f6c15207a2c662d889588b3427b4ba4cd5631d1a508987305cc3c209fd5db29a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous external URIs and is identified as a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://crewmak.ru/uplcv?utm_term=how+to+hide+apps+on+your+phone PDF link annotation
    • https://jiu-hang.com/upfiles/editor/files/5893421160.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/dekudoponefawitew.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/23178924037.pdfIn PDF document text
    • http://juncheng.tw/upload/files/jedakataxegura.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/mowipajojasin.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/24973219417.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/958323936.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/milemigexogezilelav.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/40877821241.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/burivu.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/35156783995.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/78695064728.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/19828719102.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/64910095575.pdfIn PDF document text
    • https://betsin.org/userfiles/files/wirovag.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/f7c18a5151ef0288960f3cae42450855/vofuwavaxonu.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/78780072546.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/18726592460.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/33040665303.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/94166874499.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/24833549904.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/61864428410.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/93867966595.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_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF671 18948 bytes
SHA-256: 402f78a9a7026d68aad107d58108e3be1bc59350a30c19d8a2225f8b4d1aed35
font_02_sfnt_off00012722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 10732 bytes
SHA-256: 02ef6b1cf2d8f67b7715d53a26ef070c64144289f0dec89ff1e87260f6289546

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