Malicious PDF — malware analysis report

Static analysis result for SHA-256 875bdbe284ffbed4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 00:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bddcd25d328a853e79343350662ac8b SHA-1: 841d73fda58e235cad48b8ffd8b9af6868640aac SHA-256: 875bdbe284ffbed41fab2da92911bff6b79b6126e0cdfeb75e274b8e2b54d534
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful sites.

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 http://zjbfjt.com/upload/files/14548560003.pdf In PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/48563791054.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/96823693480.pdfIn PDF document text
    • https://kopari.hu/files/file/8875039920.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/84848300020.pdfIn PDF document text
    • http://premo.at/userfiles/file/47988833100.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/47574546164.pdfIn PDF document text
    • https://tavio.ru/files/file/zafopowemunawe.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/viguj.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/49201521340.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/zotufabidi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/timovuponozutabejomemapa.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/ganesaxesik.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307db14916c---pufig.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-6/20210906185536636152.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/68250796626.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/xokibobubexewugazut.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/498003618.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/31557067591.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/34464397198.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/xamiwitamu.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/vijagizidotodezes.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/julumebinozaforakaruv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=playstation+2+emulator+f%C3%BCr+androidPDF 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_off0000d664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD664 16992 bytes
SHA-256: 5ac363ca9204875e0b62f920bb8c195f30b994d3b967718eeb93afc5365b3d69
font_01_sfnt_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 11040 bytes
SHA-256: 7be8f8223d4a33f5efd29e458da899533562118145d1d63e32478accee78ece7
font_02_sfnt_off00011aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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