Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e3effe7bf7f003…

MALICIOUS

PDF

73.8 KB Created: 2021-09-16 16:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e5f05c44f53dadde159ab9e33d2337e SHA-1: 87d8b9cb81da08fd72159b2fedac89facf282a51 SHA-256: a1e3effe7bf7f00365bdb72fa2bec1f49a037fe09d1a5c52f58db0cbe6333ccf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, but the PDF structure and embedded links indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=architecture+design+house+plans+3d PDF link annotation
    • https://emenu.hu/editor_up/saraturu.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210902175404.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/41144975311.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/lafitamifobatiwitodek.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/48814036378.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/dopupizoditoso.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109102155105845.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/munigu.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/tixurijadofuj.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/zowarejugipeba.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090710251270554.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/xilewanan.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/32721091045.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/04/8468181812.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/jiwuvupeli.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/lekijalokalobom.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/3335587044.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/bejuze.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/29305282877.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/72380297396.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/dizojilonozuvebiw.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/bibululovijepezeradewe.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/duvuvuxuvaxupofipasu.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/jugeg.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_off0000bb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD333 11044 bytes
SHA-256: 347293c06516bf8d607f820968659575b378cc0753536513c1c466152ddc2137
font_02_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 17304 bytes
SHA-256: d821104b1302154f3c9a03fb25ee5657b6b3bbe42cac819195c0e8515a80a86f

Open this report in the interactive analyzer, or submit your own file for analysis.