Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9d8da8da504eae…

MALICIOUS

PDF

88.6 KB Created: 2021-09-13 18:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c68eba6548c024b1e487c9e18309464 SHA-1: 2d008000ef027c00ad3ed21ebe4bc46a9beb7247 SHA-256: 4a9d8da8da504eae50abc614ddf0000ec638ebc77f02bfcbe2cd2f9c50e6281f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is designed as a link farm, pointing to numerous disposable hosts. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://underbutter.cz/download/foto/sagidelupopafigoted.pdf In PDF document text
    • http://ferrocom-spb.ru/userfiles/files/fuxezanetumizomapasul.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/46518157087.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/rufekirof.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/masubiruxazepegonusepigo.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/wawezerefikemafi.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/dosovijowibemutul.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0412888608c7622ab28364f468404293/rupagasamexamalabino.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/65021038485.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/3319989447.pdfIn PDF document text
    • http://kelvista.lt/images/files/sebodasozitinamumeveze.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/30886085621.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/fexijomasinow.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/43963781802.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/fefuva.pdfIn PDF document text
    • https://preciseenergygroup.com/media/dosiwupemofepupopanalul.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/pebuvegimonot.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/57057823168.pdfIn PDF document text
    • https://airshow-bg.com/file/53145653774.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/67378063328.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/murewop.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/2tv93dpcuoiegltbmpsbtjilel/47042256028.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/wofobozavuguludalotinodip.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/toxejurasegatesatu.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/3747506896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=aladdin+full+movie+cartoonPDF 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_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 10616 bytes
SHA-256: ddcc0fa6a72e4da288cf02101fafb00247e5b73258ae1034d71d0136ad20c080
font_02_sfnt_off00012682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12682 17704 bytes
SHA-256: 53a4bd9bc1347984ff29a67dac23c9e543de37de1f4f4831878ff042b50d5083

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