Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ee186d707f739d…

MALICIOUS

PDF

69.6 KB Created: 2021-09-20 20:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 625258bac73efa51f689561fdf0ef47c SHA-1: a0c585663286779264531f1371d749c0da5037ea SHA-256: e2ee186d707f739d458c2e88013a7a8f9210a5bea44f036576b9be9f91b12042
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is part of a link farm designed to manipulate search engine results or redirect users to other malicious sites. The document body is unreadable, but the heuristics and URLs point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://er-cardiff.com/eurostyl/photos/file/91852837579.pdf In PDF document text
    • http://abwingsva.com/uploads/files/77205671079.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/49456076065.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/fanidifupafa.pdfIn PDF document text
    • https://olterus.org/contents/files/87285180723.pdfIn PDF document text
    • https://koratspring.com/upload/file/sidaboduj.pdfIn PDF document text
    • https://vpmemorial.net/images/file/kosovib.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/43371361721.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/pozediwone.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/1202037011.pdfIn PDF document text
    • http://esistore.be/userfiles/file/zasan.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/31234897272.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/9916950398.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/kupapijinowixiwawaka.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210905_CD86A3BC16CFF763.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109071808013958.pdfIn PDF document text
    • http://szm.hu/userfiles/file/15649676137.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/85102441827.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/12511992879.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/69791645818.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/27830695799.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/logufefan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=clash+of+clans+unlimited+troopsPDF 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_off0000b076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB076 15216 bytes
SHA-256: 892367f69d3d6f76c5163b3fb620a92057bdc885ca9c57f43a28c32f9a372e7c
font_01_sfnt_off0000d72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 11016 bytes
SHA-256: b56935f78cd8dce3d426a6bd84206091b33548871d13afdbbf701d17e22d2686

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