Malicious PDF — malware analysis report

Static analysis result for SHA-256 795502a481846830…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 04:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ed9974bf80e60632f75fad9a12609a0 SHA-1: 82f406cd3d3bfb89cb6a7843f84976dba08309dd SHA-256: 795502a48184683085ce5a14b86096f9376d6d327b1597e8322c883c9a929e10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=el+viaje+del+escritor+pdf PDF link annotation
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/xavorafelodon.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/muwevifipad.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/15101119058.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/takakapakoditolasavi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c71c88b2fa8ef4b5962a42c49da7a1d0/10501746276.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/meferonemagawik.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/d9k66bjv1575tsfihrsjqaetis/siseki.pdfIn PDF document text
    • http://fullx.net/files/zokusigu.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/14170795994.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/lazewomazotokas.pdfIn PDF document text
    • http://esteel.my/userfiles/file/58290168440.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/fizilofodededowag.pdfIn PDF document text
    • https://makenie.com/upload/files/kavepumulefivaj.pdfIn PDF document text
    • https://ultralloy.net/upload/files/rerezojexilafibaru.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/xagilisemaravurof.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210905_B76753AAD6B970C5.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/37433660302.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-11/images/files/xaxabudimo.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///28099894437.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/luvipanovur.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/63973083746.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ganobogugavufezu.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_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 10688 bytes
SHA-256: a368cc8ccf849406accb718bbc9482b1933cc8e48fee990289a0602298e924a0
font_01_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 19736 bytes
SHA-256: 2abb1e67774f45bc1529ef4d445ab1a33bc7a2f0d441ba443896cecd5ee09028

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