Malicious PDF — malware analysis report

Static analysis result for SHA-256 390c2f5b9d917d6e…

MALICIOUS

PDF

78.7 KB Created: 2021-02-20 20:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 858e459b6753e54827f9abdfd06df05e SHA-1: 7b53c0b20723dcc95114f32448b0d0c1203a2e95 SHA-256: 390c2f5b9d917d6ee4279c2220c59a32d1204dd39a8f4264b57f5034bf88b8f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/wix?keyword=network+scanner+-+ip+discovery+apk PDF link annotation
    • https://cdn.sqhk.co/keridola/Fv6kShj/detiguxarexide.pdfIn PDF document text
    • https://bexokafosirur.weebly.com/uploads/1/3/2/6/132695536/5258410.pdfIn PDF document text
    • http://futup.ru/cheats_for_witcher_3qie4z.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/RghLBjg/dslr_camera_hd_pro_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/gjfhbhe/finger_spinner_tricks_deutsch.pdfIn PDF document text
    • http://hookup666.site/97266732657y1mh.pdfIn PDF document text
    • https://cdn.sqhk.co/zidomirit/X2TpDgg/gexodilulogol.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/ggC5ia9/musica_de_los_80_gratis_escuchar.pdfIn PDF document text
    • https://gidisapawifo.weebly.com/uploads/1/3/4/6/134611794/7239834.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/river_dell_wordly_wise_book_8_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/clerks_private_sector_award_2010_pay_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/crystal_form_meaning_in_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/inverse_of_a_2x2_matrix_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/gesafolobemosobukix.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/90173858486.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/39615775458.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/76335561851.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/17254500404.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 5352 bytes
SHA-256: 38f161b355dc395879d224054841482eb1c2a3ef5021f1d1fea8621025cb2022
font_01_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 2284 bytes
SHA-256: a81efffa75c967d1bc98efefb4ce87308f9622f6ae59e545ca068a02710c0409
font_02_sfnt_off00010856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 10704 bytes
SHA-256: fc034a3d413294516a0ecfeac993d2852f9a17e04cd0bfeaa6abce5d6e792977

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