Malicious PDF — malware analysis report

Static analysis result for SHA-256 a825e425547160a2…

MALICIOUS

PDF

87.3 KB Created: 2021-09-10 22:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2803adb97129cbc19b0393f29167597b SHA-1: 0036fe10ba8710133ad4116d2643739b840fec66 SHA-256: a825e425547160a287221b46effa15334f4ec24568fdf04e38ca206640cee1ea
186 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. A critical heuristic identified a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste content into a shell, likely to download and execute a secondary payload. Several external URLs were extracted, with one pointing to a raw IP address, which are common indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://fsgzb.com/upfolder/e/files/20210906105717.pdf In PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/wifolebaxedivido.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/87508060355.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/laniliwi.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/77681440976.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/8499580283.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/58767955296.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/90050529027.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/44422437108.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613682daccefc---rabujuvuzikuxev.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/93356490898.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/96803107170.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/15056360824.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/64307266055.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/14481677635.pdfPDF link annotation
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/wuralelotak.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/8124772692.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/54320449996.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/mivuf.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/39162128745.pdfIn PDF document text
    • https://phukienbep.net/media/files/45794054218.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/wererofu.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/vajesizasisedesudojexaje.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/zenav.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/44085187203.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/dijekigonululiliwovexesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=popcorn+time+for+windows+10+64+bitPDF link annotation
    • 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_off0000ea4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 19620 bytes
SHA-256: 1a3ff0465800563bee56ba91ae9468e7dab5ff8c714d1acadd85da28d9128bd8
font_02_sfnt_off0001358f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358F 11220 bytes
SHA-256: 56b8864fbda9462c4de142c6dba6ec72ff9a754ca82235b766597c913c3d5749