Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1339e23bdbbe41…

MALICIOUS

PDF

80.3 KB Created: 2020-12-19 01:08:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c1ddccb22992a8767bf96ce00ac1a9d4 SHA-1: da03b2d911dfade2339aa4d9a8cfe77aea9eaf90 SHA-256: 8d1339e23bdbbe41bf40cae926146721c273f2849d09a91063411ff8c1453605
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an external URI and an image lure pointing to a redirector URL, suggesting a phishing or malware distribution attempt. Although no scripts were extracted, the presence of a malicious PDF with a redirector URL strongly indicates a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/aws?utm_term=google+sheets+query+group+by+column PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5f88c68cdf218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5fcfe76a82d67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421960/normal_5f98a9f1ea7fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_5fbe298960c0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f93ccfdc9e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_5fd6de8ed99cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5f96d1d94bfda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc59cd788c99b6d37c76568/t/5fcf037a1901dd4d2ecb1344/1607402365586/a_bot_chat_with_ai_chatbot.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd008c14dfd36feeb1b6e/t/5fcf7669faf0bc04d1cd6aaa/1607431785864/sokulejugufe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13405bdb33045eec44b84/t/5fc63dc03f75b16643a87f59/1606827457754/marvin_gaye_hit_songs.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e5b8a3bf4b14aba92f9c/t/5fc17b55173fb5383bdae05c/1606515542098/fapupuzuwezezilamirujew.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 5536 bytes
SHA-256: 3cf4bca78604e1848108bba7749550a081fd25e840a59081bdf906d314a7811d
font_01_sfnt_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 11428 bytes
SHA-256: 52f00fad21af773dc24af17f79665c4d299c12be96b93059d08d6d8c6d117da4

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