Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bfe694c8f9fc28…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 01:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2c4b84b90a4b316a6b1ad734ceed584 SHA-1: 47a2a8337409cdffc45d6a538eeb7a83994a34cb SHA-256: a5bfe694c8f9fc28ad4357b4ff935eaea26a8b10e7ea71cc1be2d1bb3ab6794a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically pointing to a URL containing 'mega pro apk 2020', suggesting a lure for potentially malicious software downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links on disposable hosting, reinforcing the malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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=mega+pro+apk+2020 PDF link annotation
    • http://willajarmar.pl/userfiles/file/43056579044.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/40460542643.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/mosogokixabesubuduv.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210909_2699ADC90E27C263.pdfIn PDF document text
    • http://prota.ru/upload/files/kanuxedavivakoxud.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/82012718689.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/wogog.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/51072198521.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/juluzuvufavifelavamakirak.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/62688342650.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/falusivalibiruvax.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/powut.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/nejudoni.pdfIn PDF document text
    • http://partnercable.com/files/66920827015.pdfIn PDF document text
    • http://yanartextil.com/firma/files/doguxubemi.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/bikegopezexisimafevim.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/31767779337.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/81567271436.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/xonuxijofitejo.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/tunababavuwesarefegodaso.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/57019576705.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/defulajenetavaw.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/pevusenixine.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/kutizoranumetenozoz.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_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 10248 bytes
SHA-256: be1b9c48d9330a0fe806e51c8c2607782b1c14c9fa809fb66ffdfa29cd0b6716
font_02_sfnt_off00010d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2C 18540 bytes
SHA-256: 64dd148ee9cdccb1aa9fd1c45cb2acd44d5a992e8aa558dec4c8757a8a68468a

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