Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e35961566bc434…

MALICIOUS

PDF

63.3 KB Created: 2021-02-16 05:19:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 840a1ad6bb2242a23ec1ccc59c43f343 SHA-1: 6daad4c5dd1e448bb867b5c79efed59875442394 SHA-256: 25e35961566bc43414efe14be30327552f79d0cb274c96aab974c238886d61ef
274 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=elementary%20differential%20equations%20edwards%20and%20penney%20solutions%20manual%20pdf In PDF document text
    • https://cdn.sqhk.co/raxoxawupej/jjQoj2C/fefiwifarelubanoxiraxex.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/XjNhbji/pencil_sharpener_french_invention.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_5feaed143909e.pdfIn PDF document text
    • https://jilefufut.weebly.com/uploads/1/3/4/1/134109271/9054522.pdfIn PDF document text
    • https://cdn.sqhk.co/xinoxoxojib/geggigi/lightroom_presets_for_iphone_photos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373526/normal_5fde69a11e018.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/xukanomarexumu/watch_band_length_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/61929307043.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/xakigopefefefarorenuwal.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/activesync_android_outlook.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/73386362991.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/65006503900.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/uniform_disc_position_allocator_ns3.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/sazixanilofaxotor.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/bawokisovutarobanosedalu.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_off0000bb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3F 5464 bytes
SHA-256: a4d8711b80f88dd4c1530ed8e8727456142674252c449e22c2bb2cabf40126d9
font_01_sfnt_off0000cdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD4 9860 bytes
SHA-256: 9ca41ec064b4b0626bd6d1ed0e38728cafed5b9ca2527c77ae3b8c8be7b226f6

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