Malicious PDF — malware analysis report

Static analysis result for SHA-256 28751fdfc0ba728e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 11:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5dfdb0fd7046043940f693342baf954f SHA-1: 4df4a34ca830c22a6d47ff3dac41acd9da0bf06a SHA-256: 28751fdfc0ba728e17bc1cb8a79ee1126b8778d04f93752e12fe831731d2184b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on domains associated with link farms or disposable content. Heuristics indicate it functions as a link farm, with a high ML score and ClamAV detection confirming malicious intent. While no scripts were explicitly extracted, the nature of the URLs suggests a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=kill+the+irishman+streaming+vf PDF link annotation
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/pegetenumopetuj.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/30395832644.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/pojuvo.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/18706081561.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/raloxewiwex.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/22314398637.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/83395589818.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/69991038859.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///46721248172.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/98888911940.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394e53b3729---66005979274.pdfIn PDF document text
    • http://effektfilm.de/files/file/soveviwiwori.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139132981697---22100030061.pdfIn PDF document text
    • https://limsurempat.com/contents/files/95142178477.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/68108591557.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/51291614062.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/ledatilozanu.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/39282690550.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/60518016345.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/47331544338.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/1253787821.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/nubavibaxal.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/mabuja.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_off0000d4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 18048 bytes
SHA-256: 57d9176cc678edb4d536c84c3a2e902a207388db4c998075d6754e06ab9980d3
font_01_sfnt_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 10600 bytes
SHA-256: b5c47ddd2eadcf6ccec459471a1b17cb53065e485f4eb099a018c97f544fedac

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