Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa77b96f552d4520…

MALICIOUS

PDF

76.3 KB Created: 2021-02-26 06:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 93a98db5388b645e9a4e9c5fc2302b95 SHA-1: bcaa64ee422a63f0ef16affe5075a556856421b7 SHA-256: aa77b96f552d45207f37b15fff509dbc946525e76bccb7e846baa5b1bdc6ddd6
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to benign content, but one prominent link, 'https://druttle.ru/award?keyword=new+poetry+books+2020', is flagged as an SEO redirector for free-download phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its direct purpose beyond the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=new+poetry+books+2020 PDF link annotation
    • https://birivuben.weebly.com/uploads/1/3/4/6/134618962/52fdcd6871e9c3.pdfIn PDF document text
    • https://lonugawewubosil.weebly.com/uploads/1/3/4/6/134627014/vasuzewokunefeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453754/normal_5fee852443573.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381294/normal_60048a2f5bd75.pdfIn PDF document text
    • https://dazarurizupe.weebly.com/uploads/1/3/1/1/131164120/pefelivabut-sokojomarupele-walafu.pdfIn PDF document text
    • https://nemanuvipiza.weebly.com/uploads/1/3/1/3/131398236/878c9711d.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/tokafanawa/logo_quiz_minimalist_level_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/korerafogekus.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/kaththi_full_movie_hd_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/xolezosenunipusaboj.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/father_s_day_card_template_sparklebox.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/83102164383.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/44563423304.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/76506123095.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/kutokug.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/43661788028.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 5212 bytes
SHA-256: 88507e5de0e9641155d29c98ca87c399adffeaffd0a9979e109f39db3038d161
font_01_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 10512 bytes
SHA-256: 75c46fafae2560af43d83538e1786c9cdf931f430d0d57dbcd074c1c772f51b3

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