Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac761208e08e1fc5…

MALICIOUS

PDF

75.1 KB Created: 2021-02-21 01:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 504472993fa0bb7153d1f032132c3fc0 SHA-1: d8c2cae992e136a52f74cfb26c504838678598b8 SHA-256: ac761208e08e1fc57f001c56cd86c0e3e2d6e6286a2d97ea41f7826faf8bee8b
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to 'legacy of discord mod apk unlimited diamonds download', and a prominent URL, 'https://jacksth.ru/wix?keyword=legacy+of+discord+mod+apk+unlimited+diamonds+download', is present, suggesting a phishing or malware distribution lure. The presence of numerous external links, many pointing to PDF files, indicates a potential link farm or SEO manipulation tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=legacy+of+discord+mod+apk+unlimited+diamonds+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492529/normal_601f80301d71d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5ff5f7509ed39.pdfIn PDF document text
    • http://joretuvivofip.22web.org/app_store_icon_en.pdfIn PDF document text
    • http://doguzunagenuxo.22web.org/77109640527.pdfIn PDF document text
    • https://poxofosu.weebly.com/uploads/1/3/4/3/134308827/zatawegerot.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/pezofut/geography_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/pifogenuf.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/gefinonu.pdfIn PDF document text
    • http://gokobuvutojo.epizy.com/18569706753.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/how_to_write_on_reddit.pdfIn PDF document text
    • http://sipomivizipe.epizy.com/pikedud.pdfIn PDF document text
    • http://luwawabegopit.rf.gd/madupirepu.pdfIn PDF document text
    • http://mebewoxesare.epizy.com/25067924748.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/american_english_slang_words.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/marathon_florida_fishing_report_january.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 5672 bytes
SHA-256: c02ee95283391da8361ab432775ba5e89012e678c16e490781b6398195e358ba
font_01_sfnt_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 10184 bytes
SHA-256: 1789c384c656404363bd8ec075d35a501049769c7a31cecc46f17e56edcdd983

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