Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f9d158e4bfccd7…

MALICIOUS

PDF

42.3 KB Created: 2020-11-06 04:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: bca3ac7efe3cdb39300bc4d21a15360d SHA-1: 517bc13c0289f223dfa1976e3cee43e3da8f6a0e SHA-256: 81f9d158e4bfccd7e5efa5f71e88851b25406c6975b35e601fc16f84edd17b5c
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?keyword=craftsman+snow+blower+536.881501+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5f8fe4e640ee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f8da3062c97b.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/7922058.pdfIn PDF document text
    • https://mizunawakore.weebly.com/uploads/1/3/1/4/131406356/2071033.pdfIn PDF document text
    • https://musimisipamorek.weebly.com/uploads/1/3/4/5/134594646/zilijamuwu_vegufaxojasiw.pdfIn PDF document text
    • https://dumuwikodopod.weebly.com/uploads/1/3/4/4/134458554/5ed34111000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ba30d7-38c5-46e8-8bda-37c9e8eb1e22/8145841976.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/2283995442.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/round_rock_high_school_track_and_field.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/nogugumegovug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e70bb541-f698-4df1-a292-0d7732da3de4/napuwurotudavapikisa.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/gefujom.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/super_essex_conference.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/food_inc_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/temuxow/16054296910.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_off000063f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F2 6188 bytes
SHA-256: 7ba9715b7286c55598ebece3be321558e51ee52bd8dd65b8ac9ad27844d093a8
font_01_sfnt_off000078f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78F2 10380 bytes
SHA-256: 33f937ba033a8b71337566158fe4599fddc017e489c60eb9a79c0b01ed57105c