Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74ae910743faa20…

MALICIOUS

PDF

81.4 KB Created: 2021-02-22 17:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 32f7a85f90d103381c3c8caec2078673 SHA-1: 4fc59b548f24bcc53cd52dfe99a7afcb387d8b0f SHA-256: d74ae910743faa20ae565e42a80c016c0a5694dee5fb403ba5cbc1982aa5cce1
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 of which point to benign content, but one suspicious URL is present. The heuristic PDF_SEO_LINK_FARM indicates a link farm, and ClamAV detected the file as Pdf.Phishing.Trojan. The ML classifier also flagged the PDF with high confidence. The document body text is garbled, but the presence of the URL and the link farm heuristics suggest a phishing or malicious redirection attempt.

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://baarspo.ru/strik?utm_term=what+are+the+5+major+biomes PDF link annotation
    • https://cdn.sqhk.co/duburijudi/bjiW9if/34668219076.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/idiefGO/chrome_music_lab_songs_easy.pdfIn PDF document text
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/maresukupud.pdfIn PDF document text
    • https://kafowuvipuv.weebly.com/uploads/1/3/4/3/134337110/8248279.pdfIn PDF document text
    • https://cdn.sqhk.co/bibilofefi/qsgjihS/200872219.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/jXSMicl/purowo.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/008cb4fff4fd.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/tupofelasujewas/linus_and_lucy_sheet_music_trombone.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/cute_bunny_wallpaper_free.pdfIn PDF document text
    • http://rokazit.epizy.com/lipavata.pdfIn PDF document text
    • http://maxegore.epizy.com/texas_defensive_driving_answers_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/mimojiwefunupobozol.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/latijadifonalisegeme.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/bet365_poker_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/gabitikuto.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/sufewowanafekita.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/likazujexeza.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/creative_visualization_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/nixamenarebizosuj.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_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 5248 bytes
SHA-256: c24ab0881135b5423f007a56b530b6364d81b3f5252430bc963233244a4c2471
font_01_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 10712 bytes
SHA-256: 2b9a538e7a8deea4897b33a20f9c53b0154cd88a5397ce84e24d1d795a05c8c6

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