Malicious PDF — malware analysis report

Static analysis result for SHA-256 55498a18e65fb8f7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 11:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d631fba3ab34cb0003608c601145c77 SHA-1: 6ffb3f2f8539bf1c985d37a38c5077d1adee2911 SHA-256: 55498a18e65fb8f768ff179b057beecbcdf87b59b78bcccf683b3b84e0e5ad71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=passive+voice+in+different+tenses PDF link annotation
    • https://funcarele.com/ckfinder/userfiles/files/fosupezan.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/famatedagal.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/96942976988.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/maxor.pdfIn PDF document text
    • http://4darchitecture.org/img/all/naxezaxege.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/41916941129.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/robobuzenada.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/namavofajawoza.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/81002275837.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/67983800772.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/febofowi.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/xuxapejufibifa.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/1902812444.pdfIn PDF document text
    • http://offerparts.com/upload/files/lixudijogoxonu.pdfIn PDF document text
    • https://shibbirs.com/media/files/99056202560.pdfIn PDF document text
    • http://vladekoservis.ru/files/66509301849.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/18956537889.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/zapupojuxafewuki.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2efqk02hprs8tqo43baikgrjfr/11977433005.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/41047714117.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/zumupedi.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/24218173247.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_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 17988 bytes
SHA-256: 2e19973f2c30f4f0daa0e7d200947ad059ccedf96a8f2f6bc8f8b9179395ae7e
font_01_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 10488 bytes
SHA-256: 48945c4f7d2602f6f28de75a89b08d643594be26e908213f5b597ac2fa8f6f70
font_02_sfnt_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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