Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9281edb6caf299a…

MALICIOUS

PDF

69.8 KB Created: 2021-01-24 12:29:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: b6e5bc41f46de716f246bc5f02e9b67a SHA-1: ad81f88335c0680f3445ddaaeaa6b7474dc81cc1 SHA-256: b9281edb6caf299a9f603dacca433ff6ae2a94c22c28fc35938150c5223237d3
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://bologen.ru/123?utm_term=cazadores+de+microbios+resumen+capitulo+3 PDF link annotation
    • https://cdn.sqhk.co/wezupobuwab/hdqLhf3/govigenol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378830/normal_5fddbb6825640.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/algcT7k/lapevavuxikulixusuwegogix.pdfIn PDF document text
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/banilomesota.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/iixgcUu/97232796076.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/ejfggij/novubigigefexake.pdfIn PDF document text
    • https://cdn.sqhk.co/ladesajisama/jhohdOk/58794723064.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/Thckhgi/japan_drag_racing_3d_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/daboxazile/FhrhdRm/programa_vida_saludable_sep_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/heiQO8F/dobexupebud.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/3gXiazt/kupegabovugeluvusunupigez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451945/normal_5fddf60eeeeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_600b441150d8d.pdfIn PDF document text
    • https://cdn.sqhk.co/bibolaned/jfjjiba/kedamemoxopabususupag.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/pujinit/estee_lauder_shade_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/biohazardous_waste_site-_specific_training_form_uiowa.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/new_afib_guidelines_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/visual_schedule_template.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_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 5480 bytes
SHA-256: 3a5286669576b1ff024aade9eb989b141971e35001d004d937fb2572f539306e
font_01_sfnt_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 10600 bytes
SHA-256: 7bc583d261ebb8f14cabd4aaae547b1f5db94ca71d4900e1ca1c17c525f111ad