Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6ce2168d66607e…

MALICIOUS

PDF

69.2 KB Created: 2020-12-24 17:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c690bddcfd846238364056a96db84218 SHA-1: 23f0eefed7b33a0d5f780e66c4933d098c555061 SHA-256: 0b6ce2168d66607e71d0fa0841728062817d6863114fff2792099ba683885616
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various platforms. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://cctraff.ru/aws?utm_term=berg+balance+scale+pdf'. The presence of a link farm and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malicious redirection campaign. No scripts were extracted, but the document's structure and embedded links are designed to lead users to potentially harmful content.

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/aws?utm_term=berg+balance+scale+pdf In PDF document text
    • https://cdn.sqhk.co/toralapiluw/Kicigjb/repifadufufikilovimu.pdfIn PDF document text
    • https://cdn.sqhk.co/deguxikezu/igeicP4/30792576673.pdfIn PDF document text
    • https://cdn.sqhk.co/deguxikezu/jgjwJgi/best_guitar_ringtones_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_5fdc7bf75ece5.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/ghhefij/oil_price_news_today_philippines.pdfIn PDF document text
    • https://nutiniwe.weebly.com/uploads/1/3/4/8/134870290/778d3a3b7abe85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457862/normal_5fda848a003e5.pdfIn PDF document text
    • https://cdn.sqhk.co/jazorawa/16aWiis/jolegazotuxomebolanowo.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/764bd95b-0c90-4329-9669-81ffa49efab2/xbox_360_modern_warfare.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/tenacious_d_setlist_2012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3af1ccc7-075e-42da-91c7-a9527f32e031/assassin27s_creed_rogue_naval_campaign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1fe591e-cc76-427a-89b2-149dd056e329/clan_race_unlimited_money.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_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 5512 bytes
SHA-256: 702b087015d34cdc7d0783ecca6a107bc226e6f066db7c7746bf1e13833caf44
font_01_sfnt_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 10552 bytes
SHA-256: 17153aace5b6dfe3faca6931503e234ef01af3b19dee949a969954596a103c7d

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