Malicious PDF — malware analysis report

Static analysis result for SHA-256 935e71a7cd9c95ef…

MALICIOUS

PDF

72.5 KB Created: 2020-12-22 15:19:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 637e5885f163e950b19543411d5dd8e7 SHA-1: 9dc7a003e9e23903ce1c78cfad0418adf0daa513 SHA-256: 935e71a7cd9c95ef6e8bff298ff55f19ab55c07c94ffe8479ea256bfbf944a3c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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=concrete+calculator+lowes In PDF document text
    • https://zaxiradijewebox.weebly.com/uploads/1/3/4/8/134889682/fakatuked_tederutivelafij.pdfIn PDF document text
    • https://vezikiga.weebly.com/uploads/1/3/0/7/130739663/gajovabar-totino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5fb6b23c0cdd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_5f9272ab3a1b8.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/xojafemori/quality_management_system_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bacbd295-fa77-4ad9-8015-02b8b2c93901/yolanda_desiree_catalogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/178f008b-8bdc-47d9-aaa2-6a32a68f6d7e/good_times_bad_times_tab_rolling_stones.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/in_search_of_answers_destiny_2_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738ad300-5481-4cae-b170-e456cecfe025/52632852682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca9ebef2-52f2-41f3-8449-3379ae4f5a60/car_gear_shift_knob_products.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/chinese_collar_t_shirt_template.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_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 4788 bytes
SHA-256: 783c4b791419c64571789aebe47206400ff3889fc063cc1026341f4a7eba9370
font_01_sfnt_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 11644 bytes
SHA-256: 9e3e08cedebf53d8aa621e7a2c5f141c58cba9708525fe678c7a9abcc048eead

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