Malicious PDF — malware analysis report

Static analysis result for SHA-256 495cb3636a85abcc…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 08:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a1df7313456af372432c0fb6b91736b SHA-1: 4f796815c2f8433ab2a305092160dcc18f330357 SHA-256: 495cb3636a85abcc432b66bdf6e94a5c58a7f523b0a51cf459f91e91d855f399
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are disguised as download links for game cheats, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The PDF structure and embedded links are consistent with techniques used to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=rules+of+survival+cheat+vip+and+diamonds PDF link annotation
    • http://problemconsulting.com/img/download/files/96658272740.pdfIn PDF document text
    • http://philipsphotographystudio.com/tusiru.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/26541640491.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/92212111429.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/71445361680.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///18198280209.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/69914574464.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/pozagixekurikovogunabokoz.pdfIn PDF document text
    • http://chinahongji.com/d/files/72608240287.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210908131503.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/lilotox.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/vutaz.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/31689006658.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/pubafozurefelo.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/bakefofebawibosogu.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/95334772057.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/22783118978.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/38065124280.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/11674756611.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/panogirivuribosesidope.pdfIn PDF document text
    • https://triosms.com/userfiles/file/lerur.pdfIn PDF document text
    • http://bulmarconsult.com/files/74320375215.pdfIn PDF document text
    • https://ismart99.net/upload/files/93621933154.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_off0000ad97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A9 14876 bytes
SHA-256: fcc2b4bae6288f8806eaab99677e300d1d833fd09c0ef1cfd44c591b1d1639e5
font_02_sfnt_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 11096 bytes
SHA-256: fc18101abe6ce644099ed20e9c89d975dcfb67aa44455ece854f38465ae29139

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