Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70543669bd192b5…

MALICIOUS

PDF

79.1 KB Created: 2021-09-13 08:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94fe73115c2bacee51e205fd401e67ec SHA-1: c13a7c57426619fe89facb52fa7c149814bacaec SHA-256: f70543669bd192b547426c9600a21139221dea915c2c292daa4d86d5ee456c31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, possibly to distribute further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bd-sokolovska.eu/userfiles/file/wined.pdf In PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/61241709391.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/sirepirovurulagelewilo.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/33742612332.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/57038799562.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/gumegafafifenuseparopa.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109021657116085.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/daputegura.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/valalenojuge.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/16164166579.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613964b292446---10852769965.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/56101120447.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021912257265992.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/76702153722.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3e743391566c1193d7218f744766ff4c/lizofanip.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109120636165027.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/magagexito.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210907073724.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/dojadozimidog.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/supamoruxelipagamuxap.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/70986084961.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/29630068258.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/tafawobigizikuzenala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=steps+in+thematic+analysisPDF 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_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 16404 bytes
SHA-256: 7191b40d07ea5f179a465263aacab1d16442aeb4ffff2a0ca38aeb8732ffae9f
font_02_sfnt_off000116ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EA 10608 bytes
SHA-256: 2accef1479375b7ac242d4b06e53b9504e14d791526ffa7f63e3a9571e73e998