Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45a47010c10991c…

MALICIOUS

PDF

66.2 KB Created: 2021-03-23 10:19:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 345e5a03414fe0ed61efc9319c5e75b5 SHA-1: 73cbee8c18c9506b92bcd4d89a1d2dd2ec77ea3c SHA-256: f45a47010c10991c853dc7385ad05f7944a3c7f4b7d729fdb14505e6876d6c36
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF files, and a primary redirector URL. This indicates a link farm or phishing campaign designed to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

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://soxebez.ru/strik?utm_term=properties+of+rational+exponents+khan+academy PDF link annotation
    • https://degusatujetuz.weebly.com/uploads/1/3/0/8/130813325/xivuxofoj_zorerigawova.pdfIn PDF document text
    • http://twirlini.com/how_do_you_write_a_table_of_contents_for_an_assignmentdfqpf.pdfIn PDF document text
    • http://igoscandinavia.com/what_diet_is_good_for_athletesymdcn.pdfIn PDF document text
    • https://sawatulaboror.weebly.com/uploads/1/3/2/7/132710797/46304385c713.pdfIn PDF document text
    • https://susutabum.weebly.com/uploads/1/3/4/4/134464128/c12b784.pdfIn PDF document text
    • https://nomozusosowewox.weebly.com/uploads/1/3/1/4/131453154/jupawolurobu.pdfIn PDF document text
    • http://naturwows.space/lonesuzirujea0cnq.pdfIn PDF document text
    • https://nuzaxegef.weebly.com/uploads/1/3/4/8/134857273/9946588.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/pre_calculus_11_textbook_mcgraw_hill_ryerson.pdfIn PDF document text
    • https://judesofuvedal.weebly.com/uploads/1/3/1/8/131857090/e606a01e643779b.pdfIn PDF document text
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/jovisom.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/sojaxub/chemoffice_2015_full_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/transformers_g1_movie_autobot_deaths.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/dinagi.pdfIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/26946449770.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/xadijakisomo.pdfIn PDF document text
    • http://girofili.myartsonline.com/xugizutop.pdfIn PDF document text
    • http://xejawaji.myartsonline.com/9010554100.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/latuluxajagedixepif.pdfIn PDF document text
    • http://zaduzos.myartsonline.com/ancient_greece_olympic_games_events.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_off0000c942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC942 5628 bytes
SHA-256: 3b5428e1c70a77a2c5c357cceac259b6b3300304b7e758830b721214f672ad77
font_01_sfnt_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 9080 bytes
SHA-256: b26dc797dd1c7b396ccdc72662f4f45ba94e16961917d19df9892ef3c92c2801

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