Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b30b3936c663d53…

MALICIOUS

PDF

101.8 KB Created: 2021-03-03 20:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4fa422d0bc303643e2c51eaaf2c9979d SHA-1: c8ee40bbeec8657b8cf7cd6768a95686dd5783d6 SHA-256: 8b30b3936c663d5356160cd8c969415cbd57806e20e35df40c780f32b2a6c7db
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are SEO-themed and point to other PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://gimoguvi.ru/award?keyword=fractional+calculus+book+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/ratevusur/jfXtv45/should_i_answer_app_review.pdfIn PDF document text
    • http://phtech.site/ejercicios_resueltos_de_permutacionei5f3c.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/dGYphaa/pesufonazexotejuxeluvakoj.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/4859704.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/TDiPji1/fuzakuboverapererev.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/4iaPiek/arenal_volcano_tabacon_hot_springs_tour.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/OYLhjhc/vaxiwijerid.pdfIn PDF document text
    • https://cdn.sqhk.co/zenegiwowi/hh9ie5O/refatamutamamixiguji.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/2nd_grade_math_assessment.pdfIn PDF document text
    • https://cdn.sqhk.co/razulati/iPsh8ha/teddy_fresh_color_block_hoodie_australia.pdfIn PDF document text
    • http://openchambre.xyz/rujawuworijezadejatanelzezl.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/CijPdSf/wigebil.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/jarawaxanivu/june_tailor_sew-_in_colorfast_fabric_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/reiki_zen_meditation_music_134.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/boxulavutofofij.pdfIn PDF document text
    • http://fowimifefezujo.myartsonline.com/which_hits_the_ground_first_a_golf_ball_or_a_bowling_ball.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
    • 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_off000125b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 5400 bytes
SHA-256: 034c790e5f458d443c16894a95af8c69c76e60fe658dadf62fba2e050c1e882d
font_01_sfnt_off00013830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13830 17824 bytes
SHA-256: c01b28761ab9d685dd1d644a9cec1af8df1ebf8d9e63f0680efaa105f80a1681
font_02_sfnt_off00016ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF2 17292 bytes
SHA-256: 2958fd7091fc3a977a14ae24e5d0eb75524397e643754a0df0f7146e1818c861

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