Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cab7759a30085e2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 01:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 41267c4796926e22c0c0775e52245906 SHA-1: 7b3da1677d797f41563cb14ee66e3632a4da634e SHA-256: 4cab7759a30085e2b7a3c4c4a81f32523930f6d42cf4b0cac0e3e43b3d20a391
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://thai-apsproducts.com/file_media/file_image/file/sojejirogafeladuwi.pdf In PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/nofajinupejopumeb.pdfIn PDF document text
    • https://adikmanis.com/contents/files/wulujedodaxetanaxa.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210911175659.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/limekoberapika.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/vaneba.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f980de2474ee788d6f241d11cbb44f02/datuguzifunurijozikopa.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7dbabd836e01d223c00664160708cabf/jexev.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/ginusepus.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/87837787834.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/51089371874.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210904_172605.pdfIn PDF document text
    • http://wixoon.hu/upload/file/wefij.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/murep.pdfIn PDF document text
    • https://olterus.net/contents/files/87347109986.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/tafipatititefavewopida.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/95356952374.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/lolinisawotezabo.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/33261625702.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///ramufiferamojaworaxujivor.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/zegedisujivoguxeno.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/96040846193.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/xarikinunagogopujefap.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/kugidawefigogede.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/42408922711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+save+as+pdf+on+macPDF 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_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 18296 bytes
SHA-256: 936d197da2b3bb6e9489bbe7192509e422b09f749a2616ee88667ef76e72d423
font_01_sfnt_off00010f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001274d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274D 10688 bytes
SHA-256: 0c7b224d80ddbd74c0f0f2ae9719eff899a11e38c92415115a95d10a161bd7eb