Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed90ffa2463056b0…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 15:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 486e3a08889eca4dbb6ddb13f63906e2 SHA-1: 066664971838b8ca3eb2d143395c5454c93c3c34 SHA-256: ed90ffa2463056b0036233cd63c1cb5d99584d57d33d291687d4a8b99a88fda1
274 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of phishing and credential theft lures. The embedded JavaScript and numerous external URLs suggest an attempt to redirect the user to malicious sites for credential harvesting or to download further payloads. The document body, though heavily obfuscated, contains indicators related to payment redirection and secret recovery, aligning with common business email compromise tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 9

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • 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 https://crewmak.ru/uplcv?utm_term=expo+build+android+keystore PDF link annotation
    • http://i-tos.com/userData/board/file/vudimaf.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/nokakuliwovem.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091021192553.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/9212785939.pdfIn PDF document text
    • http://congluc.com/upload/files/63936340352.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/9288297021.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/vutelovogabakajoxoxinemen.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/gazugarakigiler.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/zitiw.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/lokifivitozowujudupe.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/gokenido.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/63323897695.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/17669580569.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/wovetofexovumemituv.pdfIn PDF document text
    • http://alatheir.com/atheirwsfiles/file/jakigavamuzid.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/fanop.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/64618284488.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9cc4c66ff---davokagigupanad.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/novanipefikujineju.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/80439386026.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/41259371225.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16147bdb5a3920---18651772118.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/sujib.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16312700311197.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_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 19660 bytes
SHA-256: b5439f48fb5be826f2ddef21fba5af426299af8caed950a784823aa5b7b4812e
font_01_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 10916 bytes
SHA-256: 22c03978033657c7a5d8594e78fe63f81f3f987b0932c8093d65fd94713372b7
font_02_sfnt_off00012f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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