Malicious PDF — malware analysis report

Static analysis result for SHA-256 97495baa0a3582b6…

MALICIOUS

PDF

68.7 KB Created: 2020-12-19 01:48:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6e31daf252e16717b8620ab9b9d8d2e6 SHA-1: 9a243ed435475d965361aaab097ef7585d531f00 SHA-256: 97495baa0a3582b6d59283bbe3b459be54c25a0a37456442447248e49a255ad3
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a redirector at 'traffine.ru' and a large number of PDFs hosted on S3 buckets, indicative of a link farm or SEO poisoning attack. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffine.ru/aws?utm_term=aground+flash+game+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4403937/normal_5fdd3a9ac5a2f.pdfIn PDF document text
    • https://sazagirisama.weebly.com/uploads/1/3/4/5/134585928/4493777.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/muwik.pdfIn PDF document text
    • https://pepusaneped.weebly.com/uploads/1/3/4/5/134503703/xalux-nukutuw-puzesekeninidov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_5f91459db272e.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/nijosinizo/surud.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/amharic_alphabets.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/zekejes.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/biblia_reina_valera_para_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/idaho_fish_and_game_report_card.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/pozelifunelepe.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/conectar_whatsapp_web_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/vowofib.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_off0000d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 5308 bytes
SHA-256: 832154ec92ca3aa65aabb9acce43e94f924bf2c1a1aa7572b01d22c53fb10bc6
font_01_sfnt_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 10360 bytes
SHA-256: 73ccf414330c5262fcaccc4bb14f69304fd98a7067d7de3a2da3ee15e1a8b5b0