Malicious PDF — malware analysis report

Static analysis result for SHA-256 b127ce0e7a4b4246…

MALICIOUS

PDF

90.3 KB Created: 2021-09-09 10:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 42f0c6e8ec61bc47a040b5367cf2c589 SHA-1: 535f183d5761a231400a28f351d961aed964f85d SHA-256: b127ce0e7a4b4246b735e97eb072698d8f4181da85d97fd324c8c178a18ab668
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document's structure and numerous links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://hfengly.dk/skoleportalen/userfiles/file/73378745220.pdf In PDF document text
    • http://tungalag.mn/userfiles/files/74355696125.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/23025604022.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/72055126202.pdfIn PDF document text
    • http://ladymamashop.com/uploads/files/202108311758338348.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/73034316837.pdfIn PDF document text
    • https://atavio.ru/files/file/kogibizukilesewaxej.pdfIn PDF document text
    • http://pjteam.hu/uploads/netewogagu.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/lozugusu.pdfIn PDF document text
    • http://inistor.com/ufiles/files/bemelufevilukibit.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/56767338367.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/fuzopogesimapuf.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16132c887d8c40---32512902600.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/82718086861.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/vakugidivabesuminab.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/levufodaxisa.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/72361831996.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/newedofemir.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/ropunik.pdfIn PDF document text
    • https://mimpidia.com/contents/files/1481349344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ethos+pathos+logos+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000decf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 18852 bytes
SHA-256: 150d64fe2a4d18f3b8e90a388cea13764d5ddf356c2702e275a68e1e01dbfc50
font_01_sfnt_off00010f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 18228 bytes
SHA-256: d2912151f72bdce9fc3a93bbce21253024712af620a208e2f557d8c946e6675b
font_02_sfnt_off00012bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000143c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C9 10416 bytes
SHA-256: 90b39c5ea688c92fdeafa9b22ae554660283edfc861e7a949c165f881edf699a

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