Malicious PDF — malware analysis report

Static analysis result for SHA-256 90da71b83dad1d00…

MALICIOUS

PDF

64.9 KB Created: 2020-12-28 10:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 43721bd8e9c56059245a5ebd6e72e2b6 SHA-1: 70fc37001aace7a5c5e7d1f14f55576dac138d67 SHA-256: 90da71b83dad1d008f494b4b83e2ee518fea177ba31e2e85161d330231e07fc4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, and it contains a high number of embedded links pointing to external websites. Notably, it includes a link to a known malicious redirector infrastructure at 'https://cctraff.ru/strik?utm_term=falling+down+lyrics+oasis'. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=falling+down+lyrics+oasis In PDF document text
    • https://mimoberojatef.weebly.com/uploads/1/3/4/3/134316463/6ef17712558.pdfIn PDF document text
    • https://cdn.sqhk.co/zixajofazadi/ijabZ4x/photo_tools_2.pdfIn PDF document text
    • https://cdn.sqhk.co/tarozawowe/fwWjc84/rush_hour_4_trailer_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473049/normal_5fe4db42008f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_5fb56323ec23c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8729de76-9f51-49bc-878c-9dd8854ea400/50024672870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc85ffe-d5f6-40b0-af49-206be277a118/dragon_mania_legends_egg_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a64c2b-6df9-4873-9f78-37e51d2f48ee/laxafedorow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/477d4b57-fb37-490d-8bf1-21a30c1b9e8f/best_business_card_scanner_app_for_iphone_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb9833b-8a0b-47cb-833a-797fb058e4b3/family_christmas_outfits_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8657c4ed-f810-4da0-9c0f-ad1e1860d494/burn_after_writing_book_barnes_and_noble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b68ebe-6ed5-4a81-b7f8-b74590a90825/nc_secretary_of_state_ucc_forms.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_off0000c346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC346 5256 bytes
SHA-256: 10cc60a913d54967fb2ee75379b939d122ab810efc8637d2535f70aa2e142da9
font_01_sfnt_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 9840 bytes
SHA-256: 4b2abb3a37ef1907e12dea71c42db3f9e645ca80df1569117022cc06c84268cc

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