Malicious PDF — malware analysis report

Static analysis result for SHA-256 1feda8db5077a6b7…

MALICIOUS

PDF

76.9 KB Created: 2021-06-09 19:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b6f5f70be99059f65e76bfcfa175a665 SHA-1: 8058366fd2c22d98aeca5f448423bc68ec02a4db SHA-256: 1feda8db5077a6b7eeac6c377074b45406eb60e793dceff4afef248aa2727e16
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://smidgel.ru/pbw?utm_term=create+bootable+usb+macos+catalina PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474734/normal_5fc80d563a279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451365/normal_6016d6d979aa7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448713/normal_5fdf380b65e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490273/normal_60332ce976800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_600d5e6d2611d.pdfIn PDF document text
    • https://zokatitolef.weebly.com/uploads/1/3/4/7/134702636/dd4ec26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_6063aa100b200.pdfIn PDF document text
    • https://zuxidonav.weebly.com/uploads/1/3/4/8/134867872/2f54b8eed84.pdfIn PDF document text
    • https://revogofoti.weebly.com/uploads/1/3/3/9/133999152/pixiguf_tanumarita_junikobul_daboperona.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuxedemama.pbworks.com/f/3784712857.pdfIn PDF document text
    • http://wigiwopajuke.pbworks.com/w/file/fetch/144533010/zolemiza.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/f/14343738117.pdfIn PDF document text
    • http://rabopadob.pbworks.com/w/file/fetch/144583881/what_are_the_most_ototoxic_drugs.pdfIn PDF document text
    • http://gepefupugalu.pbworks.com/w/file/fetch/144838887/nizaboxuwafawipusonozug.pdfIn PDF document text
    • http://zikasamu.pbworks.com/f/10661150162.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144457032/download_kamen_rider_ryuki_episode_3_sub_indo.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/ganaxeto.pdfIn PDF document text
    • http://lodenapokot.pbworks.com/w/file/fetch/144684348/98536747126.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/w/file/fetch/144562938/el_gran_grimorio_dragn_rojo_wikipedia.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/f/bitlocker_recovery_password_viewer_tool_server_2008_r2.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/nadebuzuletiloweroreno.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_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 4992 bytes
SHA-256: 12168a97499fea94bbc1305fdfedc4cb9a4069d37fd3fab682d78d70c9b0e293
font_01_sfnt_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 10800 bytes
SHA-256: 1f2a743201c90cd98e6bff13b9119dfcc7899e01f750a13913a8884ed23af32f

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