Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ffd9fd0edea9f0…

MALICIOUS

PDF

70.8 KB Created: 2021-02-24 13:05:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 1c4351f768c4bd2e02292af0db07e774 SHA-1: 80f39d482f40a8a6c25b655e11e3dcf87adadcab SHA-256: a2ffd9fd0edea9f0106209962410ec2170c90472d94c10da90fdf529dfb172cd
254 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=audiolibro%20el%20rinoceronte%20pdf%20gratis In PDF document text
    • https://cdn.sqhk.co/ratugetaj/309ibKh/61365745099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454819/normal_5fc87b1e4d1d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417995/normal_60053b662050c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5fec32457380b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378379/normal_5fdf2c2dc4a98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_600cb7dc209b7.pdfIn PDF document text
    • https://namavikevak.weebly.com/uploads/1/3/2/7/132740743/kesemir_guduxefojudo_jefewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://metusajixano.epizy.com/nutaga.pdfIn PDF document text
    • http://jefeduwikiw.epizy.com/tamumobinoxuzowenebadurab.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/bedsheet_online_shopping_india.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/how_to_find_distance_travelled_from_displacement_time_graph.pdfIn PDF document text
    • http://vosowetawevu.epizy.com/begazajivunorod.pdfIn PDF document text
    • http://sunemixawuvija.epizy.com/peer_pressure_on_academic_performance_articles.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/mefasepavapi.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/futurerestore_guide_ios_12.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_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 5452 bytes
SHA-256: 34e29bed91647b3ab443f576c0b72e0cb0bc251acaa8f089d0db2aa0720221ee
font_01_sfnt_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 11340 bytes
SHA-256: a3cbc1d5d555ceb4633cd1132112b16ac4aca0efc326eba3b5a69b68b0a12498

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