Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa874a2c0de1969…

MALICIOUS

PDF

89.5 KB Created: 2021-02-17 14:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0f94cfc107bffcc1b7e49cb64ee15abf SHA-1: 41e2a113abfb8a82c383c0fadd950aa81c880590 SHA-256: 2aa874a2c0de1969fa171ee0eefb9e46dabfbafd55fffec2fc34b66e42b7e361
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's designed to direct users to a variety of malicious or phishing websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves leveraging the PDF's structure to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=polanyi+m.+%25281958%2529+personal+knowledge PDF link annotation
    • https://cdn.sqhk.co/vafodagusun/ggjbYKJ/mobile_border_light_live_wallpaper_led_color_edge.pdfIn PDF document text
    • https://cdn.sqhk.co/moturira/HghWjgW/perfect_slices_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/eeAyfgg/75477960771.pdfIn PDF document text
    • http://umkatrade.ru/atlas_copco_375_air_compressor_manualzsv3n.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/fhfgjji/international_superstar_soccer_98_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/gjhhDFW/free_online_code_editor_python.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/12926163198zuhm0.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/hjijHuy/mens_christmas_running_shoes.pdfIn PDF document text
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/vaxewobedezi.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/jnzjaMO/95127341843.pdfIn PDF document text
    • http://idealica-uficiale.website/20073481664tnrbj.pdfIn PDF document text
    • http://legendarycraft.ru/pevujawejisuyuhs3.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/panalipolifod/autograph_movie_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/80140216807.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/a_good_wife_game.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/bulb_smart_meter_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/jokikupigu.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/alaipayuthey_video_songs_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/acronis_true_image_2018_kuyhaa.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/59071643872.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/joxawetolel.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_off0001138e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138E 6252 bytes
SHA-256: 3240639572bf6c0cb47e564554f220e54c3e280fc22dc98226d10624a883a994
font_01_sfnt_off000128f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F2 15100 bytes
SHA-256: a57cf00e9eeb3ef7288e2f0de8a6be9cba5bc9a250eaccd70747f3931dc2f6ff

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