Malicious PDF — malware analysis report

Static analysis result for SHA-256 31503ca83953fcc4…

MALICIOUS

PDF

74.7 KB Created: 2021-02-10 20:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 199e072179ef50bae87430d700fa0535 SHA-1: 80f0eaf19c60954d045f57013b3855ecc3dc7b1b SHA-256: 31503ca83953fcc4b795796961958a36ffccdf8f73b568e220dde1688762a2ac
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple external URIs, some pointing to disposable hosting. A critical heuristic indicates a 'Clipboard command execution lure', suggesting the document instructs the user to copy and paste content into a shell, likely to download and execute a second-stage payload. The presence of numerous links and the nature of the lure point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/aws?utm_term=mathematica+10+free++with+crack PDF link annotation
    • http://atlas-copco.su/86015618303569qq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_601e701ce507c.pdfIn PDF document text
    • http://nature-ital.space/76044916603zdrzq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5ff9064593062.pdfIn PDF document text
    • http://konobemozitu.iblogger.org/dallas_county_probation_report_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469359/normal_6003161a3a05e.pdfIn PDF document text
    • http://jukekelexoseda.22web.org/darkest_dungeon_warrens_guide.pdfIn PDF document text
    • http://tunizunifegitof.66ghz.com/74267324029.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372361/normal_5ffeb551cfbfe.pdfIn PDF document text
    • http://salearea.pro/zotovigabanifikoninofinegk6n1i.pdfIn PDF document text
    • http://repair-telefonov.ru/vurikw1cig.pdfIn PDF document text
    • http://meetporte.xyz/botunerulic3gr5.pdfIn PDF document text
    • http://helplnstagram-confirm.com/mcgraw_hill_physical_science_online_textbookhqqch.pdfIn PDF document text
    • http://shortsomfj.space/dabudo7wovp.pdfIn PDF document text
    • http://kvyovk.xyz/sport_racing_carsx88hb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fobonerenajob.epizy.com/chopper_2000_movie.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_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 5268 bytes
SHA-256: b0b142aea02ed8b5fa1441ccfc1a3eaff899292da8a948521e5efed000ee8b35
font_01_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 10868 bytes
SHA-256: d9fbb99a6565d7b41d9fc45e71cf32a69cd953a214be31f47028713ae3306314

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