Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c23f43434d2a9c…

MALICIOUS

PDF

69.8 KB Created: 2021-01-24 09:15:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: e4680bac33c03ae978088c67ce5e40d7 SHA-1: c86edbe648d9515425684793102bb027f5374134 SHA-256: 40c23f43434d2a9cca9fcbdcdb2ade40c541d08109298394e852236dcb978997
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wb?keyword=crazy%20taxi%20classic%20game%20free%20download%20for%20pc In PDF document text
    • https://kukatuvitakutir.weebly.com/uploads/1/3/4/6/134690336/3f3fff908e76a35.pdfIn PDF document text
    • https://mikotefi.weebly.com/uploads/1/3/2/6/132695671/paluzunitogixew.pdfIn PDF document text
    • https://tetoxoji.weebly.com/uploads/1/3/0/9/130969306/sunuzamiluwi-nibowogan.pdfIn PDF document text
    • https://bugebapujeze.weebly.com/uploads/1/3/1/6/131606260/c1ad2d632b5.pdfIn PDF document text
    • https://cdn.sqhk.co/rukeditele/zuGGmgc/best_homemade_ice_cream_recipes_without_eggs.pdfIn PDF document text
    • https://wufezaju.weebly.com/uploads/1/3/0/7/130738917/pixun_vikog_mapawukige_rivupusakamepor.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/xalexojaxipud/46295290872.pdfIn PDF document text
    • http://kefixofelapadi.epizy.com/bajaj_auto_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/realismo_magico_libros.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/gubumuj.pdfIn PDF document text
    • http://bavidoripo.epizy.com/bopunemivaxoviro.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/english_synonyms_for_entry_test.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/free_auto_service_manuals.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/all_lovely_ringtones_of_movie_taqdeer.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/50771642392.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_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 5692 bytes
SHA-256: 9ac6f253dd3ae4280dc7fc4c2c5cf022d1b402fda6788e8e77049f08909cdffc
font_01_sfnt_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 10808 bytes
SHA-256: 771ddc1850298a7ca576545032616a1e1cb104ddbedfe79af60cb2af5e7237dc

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