Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b847d95e37e8e4…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 05:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e40b392b0d148eb5a16b79c4a101c629 SHA-1: ef77cf1896ac708efcd12267e5d45845a11aaae2 SHA-256: 40b847d95e37e8e45b8a73f9391827d999525fe649a2be8ed1e13b8d73305281
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jshtextile.com/UserFiles/file///5834467632.pdf In PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/34006619436.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e732f16b6e8fbd22a8e9fe02e0644e5c/vaxijumapasebutemomedakak.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/65830431296.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/gepadevexu.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/boperinetuwebefosi.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///kiredaguromananuzemovawe.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/91512386241.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613984918247a---34365504524.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/kilafetak.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/37430104116.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/sutoveborije.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/bedisunono.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210903081937651.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/41922965531.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/26156595553.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/5316654115.pdfIn PDF document text
    • https://timminsrenovations.ca/file/ZD8Me2FOc62mTxl3.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/xusovifokexubarozupo.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/dugemetesigab.pdfIn PDF document text
    • https://vpmemorial.net/images/file/12064085419.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/walanekufobazuvot.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/nalewonozagodeniriw.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/zotofabegirowazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=golf+master+3d+apkPDF 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_off0000c846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 17348 bytes
SHA-256: 757866d517d681b1efad36e2f00c74fa8df4cb87b7417837140c5dd0285c27c9
font_02_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 10768 bytes
SHA-256: 597fc3ce0ac85144e969246804b2dd23f3ba5ffe19d3435943cfdb9fed4f5d6a