Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90eb86763f22da1…

MALICIOUS

PDF

72.3 KB Created: 2020-11-26 05:54:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 3de61baf76c51e43f369ed3f9c3743d1 SHA-1: f89ae8b20433171415078c291ce06d6782024e12 SHA-256: a90eb86763f22da16a69cc2d69e13d720b2c2cc427cf8d64ef186fac062e0496
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, with a high ML confidence score. The primary malicious URL, 'https://cctraff.ru/strik?utm_term=los+padre+de+la+patria+dominicana', is presented as a lure for downloading content, likely leading to phishing or malware. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=los+padre+de+la+patria+dominicana In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f870adb6c400.pdfIn PDF document text
    • https://nibuzexo.weebly.com/uploads/1/3/4/7/134720699/f13190a30c4392.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/1faa102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403823/normal_5fbf12b94038e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kakekojezutok/adobe_suite_2_free.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/holi_khele_shankar_bhola_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/concepts_in_biochemistry_john_wiley_and_sons.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/vamijuzezedezina.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/parivofunimazaxadamilun.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/old_is_gold_02.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/kelubupanaxijuku.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/bad_time_trio_simulator.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_off0000d116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD116 4948 bytes
SHA-256: c49facce10a93f5942f0c9bf645b94f2481d38dfffc7a38e858edf10bd6f67d1
font_01_sfnt_off0000e1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C8 10748 bytes
SHA-256: ffb4bfaedbb7facef3624f05a453ad1add330dca383557626125074443988980
font_02_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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