Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a25c05d2454a429…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 08:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d082a3c35b849d1524da7cf74662ea9 SHA-1: 66fcf105005870e46ddf3fd2bcfb71d82f0b3e88 SHA-256: 4a25c05d2454a42982a271357f0835c77bbf3a5b46887f932001814758650df1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=android+sensors+not+working PDF link annotation
    • https://www.nstoplana.rs/ckfinder/userfiles/files/99221530311.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/nixigavasunixidozam.pdfIn PDF document text
    • http://boldogelet.hu/media/30942793411.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130747b319ef---1257995867.pdfIn PDF document text
    • http://tavio.su/files/file/96800217978.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/nikokudutobopusaximavema.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/76757638397.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/23087931254.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/rapiwegizanatasaji.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/gizetar.pdfIn PDF document text
    • http://denge.aero/upload/files/57502728935.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/bevuvedoxezixi.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/jidimetajejavakakalix.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/tozufogupikuj.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/nivukokumajamokarub.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/sekixe.pdfIn PDF document text
    • http://clerus.hu/files/file/voxumoziwupolosaw.pdfIn PDF document text
    • http://taociren.com/upload/file/2109060918304157527a2ou56rdt6f.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/42210409980.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/kuxaso.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/pevemilutus.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/85358784913.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/37483472506.pdfIn PDF document text
    • https://synersys.fr/contenu/file/geboregutuwaporafu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/gubopareta.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_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 17184 bytes
SHA-256: c31ae88043be3ec309608b1af37b56a856ff07361e1b517927386d833865b323
font_02_sfnt_off0001242c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 10376 bytes
SHA-256: 7ff29946dabaf2c9e19c11bcf2551dedbc9a77548eb07fd874000313ec3e5e68

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