Malicious PDF — malware analysis report

Static analysis result for SHA-256 49dd58c2c40f44c2…

MALICIOUS

PDF

68.4 KB Created: 2021-03-02 16:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 838f73ac8c8ada7c56cbff7b35b7cd42 SHA-1: 69db59a75e52e9db5f77126c4a3f2b55ab197a2c SHA-256: 49dd58c2c40f44c276229a4308d9889c5127b756bb9e7459a47c319cf6f86e16
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://pelibifir.ru/award?keyword=sheridan+blue+streak+rebuild+kit PDF link annotation
    • https://lekusimije.weebly.com/uploads/1/3/1/3/131383821/d0168e57d2b4.pdfIn PDF document text
    • http://hookup157.fun/how_to_write_a_process_speechog6mw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_60328fb94ffff.pdfIn PDF document text
    • https://pigaxapi.weebly.com/uploads/1/3/2/8/132815084/2515407.pdfIn PDF document text
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/tupuxinizunuzor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413475/normal_5fcb6e1050201.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/litopinizuxe_foxenazasob_xozovug_momoka.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/fatisake/47376452246.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/51403143939.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/13403620039.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/kunigaseliwusogapabekiv.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/celtic_cross_stitch_patterns.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/suwidekojam.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/2nd_grade_money_word_problems_worksheets_free.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_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 5220 bytes
SHA-256: bf57ba15603ad6d1f4e6eb97ac6e6754931ee6e1e1ff1bdc98d61740161174ab
font_01_sfnt_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 10392 bytes
SHA-256: a97d250538d828d287f163bc47360d76bc5cff23e8846739bd5f894587530545