Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c88ba3e122cd05d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 05:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ce40dc9277fa5d5ba3530bb1002b27d SHA-1: 78fe2feb3401296401f32326bb2a9c43ada163c8 SHA-256: 1c88ba3e122cd05d19aace7fcbe55ba7e1d4acc242a3de784ec95b53e6ebdd3e
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF document exhibits malicious characteristics, including the presence of algorithmically generated URLs and a lure designed to trick users into revealing sensitive recovery secrets or private keys. The document explicitly instructs the user to copy and paste content into command-line interfaces, suggesting an attempt to execute malicious commands or scripts. While no scripts were directly extracted, the heuristics indicate a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=marathi+movie+download+torrent+magnet PDF link annotation
    • https://renebeumer.nl/userfiles/file/57863918249.pdfIn PDF document text
    • http://hadt.vn/upload/files/sezewafivi.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/dibinedawadeb.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/48284091000.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/68503116016.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/tubalafujatitonaw.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/falaradibamokorabosezar.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/17151756503.pdfIn PDF document text
    • https://norservis.com/files/files/44145399071.pdfIn PDF document text
    • http://citra.cl/userfiles/file/962143386.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/81842298282.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/3964734825.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630501243.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/mumejuloxejumovipiwilidup.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/zorolufokul.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210907_808C34A86FE15764.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vojokimozunomopaf.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135ffaa6cbd0---78645823140.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/fijox.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/78789002169.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109071015136274.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/65827870591.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 17956 bytes
SHA-256: 7e80856300b99604d2467baecae2da3a5ab8cc7c36943992d8f70e17a6006071
font_01_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 10672 bytes
SHA-256: f8c48e02b2ae12c872df87e6b353ecb59e502fb31f84779f2108b2d08db42a0c