Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ca993e0d376325…

MALICIOUS

PDF

73.8 KB Created: 2021-02-17 18:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 78474027c10394fb7cbf0f3986e8385e SHA-1: 265d38faecc13063c5dded01d175376908a2337a SHA-256: 64ca993e0d376325395ec9449f7cebfdbda46173430cc2c1193149b190d31eee
244 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM, indicating it is designed to host a large number of links to potentially malicious sites. The ML classifier also strongly indicated maliciousness. The embedded links likely serve as a lure to phishing sites or to download further malicious payloads, aligning with a spearphishing attachment attack pattern.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=what+do+navy+officers+wear In PDF document text
    • http://edalovert.xyz/fifijadakug1ox4.pdfIn PDF document text
    • http://fullstacket.online/kokugupoza1vf6b.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/jGYgeji/funny_video_whatsapp_status_share_chat.pdfIn PDF document text
    • https://cdn.sqhk.co/zivalutapa/njgpTgf/run_3_flash_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/ehaijie/screen_recorder_screenshot_video_xrecorder.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/nibjfgj/battlelands_royale_mod_apk_unlimited_health_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/bTfzj8x/33207697977.pdfIn PDF document text
    • https://cdn.sqhk.co/rizonozugaj/ikhc2ie/rutosufowuro.pdfIn PDF document text
    • http://ru-en.xyz/the_boy_who_harnessed_the_wind_chapter_1-4_summarywa73s.pdfIn PDF document text
    • https://cdn.sqhk.co/minutakumu/dqFjdib/business_development_manager_salary_los_angeles.pdfIn PDF document text
    • https://wobanuwu.weebly.com/uploads/1/3/5/9/135959505/bd4e1d96ed1.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/fZXhaif/wubixitotow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452834/normal_6000a8147123e.pdfIn PDF document text
    • https://romarifekaxa.weebly.com/uploads/1/3/2/6/132683260/pozilokuw.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/tarinikamapizisuj.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/jcLjjqE/jiwozelonorugun.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/gYiggeD/benutose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 5344 bytes
SHA-256: a657fe5d05a062f4f69286f47fb264df09ea11e26ef0f23fb16c06bbeae0a47b
font_01_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 10620 bytes
SHA-256: 26bc31470c64e22da27cfb015e50fe5202fa8d6eec06776b750ef49976387c7d

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