Malicious PDF — malware analysis report

Static analysis result for SHA-256 5378e9bd656d00da…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 10:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c397b762bfa9d883e20ed156858cf76 SHA-1: fda79d6981a1b3bf4affae17d180c9c6525c3917 SHA-256: 5378e9bd656d00daedcf5fc172c6aa2d592dd049cd60a9ca95841e7a33e47100
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious domains, identified by heuristics as a link farm on disposable hosting. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The presence of external URIs suggests the document's primary function is to redirect users to these sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=ra+one+full+movie+download+720p+bluray PDF link annotation
    • http://tt-ural.su/admin/ckfinder/userfiles/files/pixafarunopifamubuzile.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/34165522922.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/36514716212.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/31827422133.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/65503953611.pdfIn PDF document text
    • http://word.mn/uploads/assets/wopew.pdfIn PDF document text
    • http://www.polni.si/Images/files/44923108856.pdfIn PDF document text
    • https://electroagro.es/pub/files/zadovudusuvulujefam.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/27436772368.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/nogali.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/xoxefobuduxigataw.pdfIn PDF document text
    • http://sro52.ru/uploads/files/44117263034.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/zaniwekopajawinala.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/3276102591.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/vesalobakefevepujuvi.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/6128028622.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/dakaxajenavenumuk.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/jojijorawiduzubidavutakim.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/mavuwopulom.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/midikejexenategudirezovot.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/47612172022.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/zulibixopu.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/54772615516.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/kewifef.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_off0000d5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FE 17864 bytes
SHA-256: 3b6839fde172299bcd718043b120f86226fc6c3033fbe9a3053401b7281b9441
font_01_sfnt_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 11236 bytes
SHA-256: d8f79e9e0a9ff7dc04f9b17b02db9730356bef729b672d986f8d13ef964651cc
font_02_sfnt_off00011ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1