Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb481e045ea2cc0…

MALICIOUS

PDF

97.5 KB Created: 2021-09-14 17:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e15d558f3c148c173b5e639c7c0d7e78 SHA-1: 8279ae54d8e0fcc2e0d27423e85cd3c477bace91 SHA-256: 2bb481e045ea2cc0d91da219f3196b3786e1335523b6057dd3a41751f85207b8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery information from the user. Numerous external URLs are present, suggesting a potential phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=edit+apk+in+android+studio PDF link annotation
    • https://cooperadora.grupocreartel.com/documentos/archivos/lagaxezuwalusex.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/81143891484.pdfIn PDF document text
    • http://anindecor.pl/files/file/kadafovinome.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/14714758265.pdfIn PDF document text
    • http://annabarons.lv/files/files/58607125831.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/buveruzusalakowigigo.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/nexiruwavezakunutezofe.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/bijime.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/57420067961.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/ziratidepirirusanugawe.pdfIn PDF document text
    • http://hiddencliff.kr/FileData/ckfinder/files/20210904_FC725B35DA6918AB.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/pikazizu.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/wikujugunavunake.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/74713542088.pdfIn PDF document text
    • http://prmakeup.com/Image/files/72140177907.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210905171651.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401ad296aab---jopujonejagiwupajedetol.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/85748328662.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/7023580021.pdfIn PDF document text
    • http://eichler-kammerer.de/40231874859.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/mowirutonopanazalinotor.pdfIn PDF document text
    • https://rosycaffe.com/file/nipafefemomedune.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///28662429573.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/45583869826.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/84003535964.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/5342946070.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021911954286794.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_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 18324 bytes
SHA-256: 1be487c6f37d1e54341af080822ebcba7f4e95f976b676723d9e12e9e1f45d96
font_02_sfnt_off000160cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160CF 10384 bytes
SHA-256: c00585c777f3e07d16a0c41b243a175d04822bdb3f75a53bd515345b72f3d3fe