Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8246512a8d8a1b…

MALICIOUS

PDF

70.0 KB Created: 2021-02-18 21:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ef0a76379c58a700f60e7496efa29e12 SHA-1: a973c04146e0c8f63c6701760deb5d97176342b9 SHA-256: 2a8246512a8d8a1b24feedf014f9c43846494b699b9b49d65b142e140f42bb07
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://yafferge.ru/wix?keyword=throne+rush+cheats+tricks In PDF document text
    • https://cdn.sqhk.co/moxoxitij/hdiahea/bineruzufujosako.pdfIn PDF document text
    • https://vorapitejure.weebly.com/uploads/1/3/4/6/134605364/kovabutovunug.pdfIn PDF document text
    • https://cdn.sqhk.co/lerepetoni/KmjihiI/alan_walker_greatest_hits_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/qjg2vhc/small_cute_cat_wallpaper_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/88jhEA6/16579374108.pdfIn PDF document text
    • http://lagujegivupani.22web.org/darkest_dungeon_courtyard_provisions_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/gagupibi/qfohgja/45359549152.pdfIn PDF document text
    • https://kaxozugusejerob.weebly.com/uploads/1/3/1/4/131452826/dozafugasumipobi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mubomapobe.epizy.com/cyber_security_vs_information_security.pdfIn PDF document text
    • http://zufonokimilije.epizy.com/waxexopitapigele.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_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 4868 bytes
SHA-256: ad48c8343f7b23a17ce2511cc1b4c3cc2ccc0fc142c5afe3671a7f9e05bbe5ed
font_01_sfnt_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 10368 bytes
SHA-256: c0d67038060de3f54e207d0e882a96ce59f45aef89f63f6a263fd0f99011b614