Malicious PDF — malware analysis report

Static analysis result for SHA-256 26dd4c71bc8b8a12…

MALICIOUS

PDF

71.3 KB Created: 2021-02-24 03:20:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b3308b1ae6275aeb480b1027e554b730 SHA-1: bab3fb18a0d2505f5174b39c16dd4de2f5ed33e1 SHA-256: 26dd4c71bc8b8a127556089d61d3705ef820d5ac176cb55e3a5bbb8f39d7bd93
196 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/aws?utm_term=algebra+de+baldor+ejercicio+106+con+sus+casos PDF link annotation
    • https://cdn.sqhk.co/kikutajaz/XyhaVvv/mutedamojojiwoxive.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/ca59c9370ed69.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/5415812.pdfIn PDF document text
    • https://makirogu.weebly.com/uploads/1/3/0/9/130969002/farajifaz-gusananibire-wivuxibudemu.pdfIn PDF document text
    • https://tuzisufuga.weebly.com/uploads/1/3/4/4/134458332/ae99fa.pdfIn PDF document text
    • https://zifofuxe.weebly.com/uploads/1/3/5/3/135386801/gosidiramina-takikopotafusu-wafomamenanis-juvamoxusexoj.pdfIn PDF document text
    • https://gokebapin.weebly.com/uploads/1/3/5/3/135320588/diwumafis.pdfIn PDF document text
    • https://metekazup.weebly.com/uploads/1/3/2/8/132815755/jixafijomi-wegizapot-venofaji-zotojanuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447433/normal_60349f37ade79.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/9125207.pdfIn PDF document text
    • https://cdn.sqhk.co/bafujifi/djexnkx/28468681992.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/gebukil/64173810240.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/water_test_shows_coliform.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/how_does_cultural_diffusion_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/federalist_78_questions_answers.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_off0000d51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51E 5660 bytes
SHA-256: 5e91d0d84319891428ea10c1e0189f24f947580f4e16c96e01010fe91c752d54
font_01_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 11728 bytes
SHA-256: 7742e669827e6ac602ff09a8818c9fae958ccdf6a1e3043b893fa212f3edca3f

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