Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf127683f1edfde2…

MALICIOUS

PDF

64.2 KB Created: 2021-02-06 20:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b789c82216a9740e2633dfcb21828950 SHA-1: 16d49f3d486dd16999f2478172443dac2788a618 SHA-256: cf127683f1edfde2fa424786b3b95455397039f94fb59492ac54b8e2ba632471
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wb?keyword=ayewo%20by%20bukunmi%20oluwasina'. Additional heuristics indicate the PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=ayewo%20by%20bukunmi%20oluwasina In PDF document text
    • https://cdn.sqhk.co/gujuvizaja/jcgdohh/world_flags_with_names_hd.pdfIn PDF document text
    • http://securityverifiedservices.com/kibunigerekutw2lw.pdfIn PDF document text
    • http://newser.site/neserevavivuruaq9o8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475864/normal_5fca2e6c81281.pdfIn PDF document text
    • http://pujesuwidiw.22web.org/kufevelerurel.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/ijl0hgH/9373839493.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/hajgojd/vegan_gluten_free_chocolate_cupcake_recipes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwomuf.rf.gd/southwest_carry_on_bag_guidelines.pdfIn PDF document text
    • http://fafovinipola.epizy.com/juxeg.pdfIn PDF document text
    • http://damikofem.rf.gd/picsart_background_hd_images_blur.pdfIn PDF document text
    • http://bopevevene.epizy.com/alien_vs_predator_300mb_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/ratuparuvovu.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_off0000c105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC105 5124 bytes
SHA-256: 3c6ebf6ad64ae810bea37417cf09d215bbb45846b48f34cb03cca27b267760a2
font_01_sfnt_off0000d279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD279 9864 bytes
SHA-256: 462d0e8ea5249e1d4296eb151110bca36c72da6b8c8c61b353208536ea9ddd78

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