Malicious PDF — malware analysis report

Static analysis result for SHA-256 3443c209b53704d1…

MALICIOUS

PDF

91.4 KB Created: 2021-09-18 07:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1272bc95f52f1fb655d80f2b4d178ab6 SHA-1: 4e4e76ae82804fca341e67ba949744d99f0f795f SHA-256: 3443c209b53704d19728311ca1aecc1b33a8667baad7fb53a2a11316afdba0a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL distribution suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://kagoshimakojintaxi.com/userfiles/file/vipelupazozo.pdf In PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/48507780447.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/suwivonigirufi.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/wipevafowodowifasosusoge.pdfIn PDF document text
    • http://xfswchem.com/upload/files/76178687135.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/48506106854.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/22664481232.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/kiloreruz.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/63302365560.pdfIn PDF document text
    • https://izometal.net/mm/file/44750637394.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/devewodexowiguguvaxufizof.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/gowiwuganulepo.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/68661391492.pdfIn PDF document text
    • http://kaies.net/upfiles/210904074944992386w2np50.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371854d447c---sojisidozob.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210910/files/20210910050723.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/62577560879.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/39371745050.pdfIn PDF document text
    • https://aitalk.vn/upload/files/juvamazisadedim.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/87926804502.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/retuludejesapuxes.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/77636609006.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/79607408734.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/wupiwexuforimut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=old+indian+moviesPDF 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_off00010419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 17228 bytes
SHA-256: 0c1d7c2aa61dd17e1d41fc6261b35ff75b6f803a16d10cf345b4400e702d48bf
font_02_sfnt_off000148d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D5 10300 bytes
SHA-256: 3b077f648daad8e08a214836d8c366fe56ec7c7c519eeefb273c256048ce630b

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