Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37235ef4d4cf934…

MALICIOUS

PDF

67.1 KB Created: 2021-02-05 10:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a6d80544a22900f9a42fbda4cbf7ee83 SHA-1: 80c06fd9a503fbc4eeff125d27429df5a15db540 SHA-256: b37235ef4d4cf93476e57ce6b15e7e7884d56d4c663433d305fe00e82c4803e2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign content, but one primary link to 'jacksth.ru' is suspicious. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, appears to be a lure related to engineering materials, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/aws?utm_term=ashby+engineering+materials+2+pdf PDF link annotation
    • https://nirusiji.weebly.com/uploads/1/3/1/4/131407521/tukoduzimoromawa.pdfIn PDF document text
    • http://fepotarugagi.22web.org/2109274680.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/fomikefa.pdfIn PDF document text
    • http://study-english-04.space/libros_de_numerologia_tantrica_gratis7za7y.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/barbie_and_the_diamond_castle_free_downloadyuu42.pdfIn PDF document text
    • https://widijusadapabi.weebly.com/uploads/1/3/0/9/130969823/fexidirifukel_xetug_tekoveja.pdfIn PDF document text
    • https://ginegumogigoxi.weebly.com/uploads/1/3/2/8/132816185/kifib_zofijafin.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/zaxuledo/free_audio_cd_covers.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/15685479867.pdfIn PDF document text
    • http://nokemufebevezo.rf.gd/texas_hunters_education_course_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/60097815176.pdfIn PDF document text
    • http://rowomasogig.epizy.com/investigation_report_sample_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/pibekebisawavonutavabu.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/cartoon_song_status.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/dekixovuwap.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/bus_map_bangkok.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/baskerville_old_face_font_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/play_school_drawing_book.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/laurent_perrier_ultra_brut_tech_sheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E8 5816 bytes
SHA-256: f7df35933d88d08ddb59988516281e04012fed323c75ac15376795806c698188
font_01_sfnt_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 9804 bytes
SHA-256: d1dc0bd7fb6168ce4c6dcc98b17faf18c91aeb8071b53066d8a305d1a19b96a4

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