Malicious PDF — malware analysis report

Static analysis result for SHA-256 625f2edc395384b5…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 19:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34008f26181362f7ba1790453a936c02 SHA-1: 921853045defa42c13a0abfe5908dfad7cdec34e SHA-256: 625f2edc395384b5268b7975a1d5414882b53613e227f1c4b530f3c9ccce3be3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure point towards an initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=android+studio+calculator+tutorial PDF link annotation
    • https://classykitchen.pl/web/uploads/files/vewed.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/lubijifir.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614096107d6d2---fadak.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/3048323356.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/nofipopufadebiximidiba.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/nezakowalurowemuwuwubiv.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/24245141704.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/nelevezojabaz.pdfIn PDF document text
    • http://totoumi.jp/upload/file/21706894036.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/5665681199.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/19155262785.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/jodukibepupuboki.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109110348443719.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/30661101157.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/93769881526.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/kuwunazipisoxivubu.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/masedizapoj.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/18431699400.pdfIn PDF document text
    • http://elitvorota.ru/f/file/firatot.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/14dad767fb774114ca5a9fdc41de2695/solowatukarujufedukil.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/20326760506.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/warub.pdfIn PDF document text
    • http://apart1day.ru/file/25002605436.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_off0000b2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0B 17872 bytes
SHA-256: db9dd1c9cc651483b466e283fdba192296d79595587b3d78bb59779f17aabae8
font_02_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 10312 bytes
SHA-256: 0b9c465dbc1865674241ce54d1966feec9a6e7c30678b152e42d4904af912795

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