Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7f3f78b70e591d…

MALICIOUS

PDF

89.8 KB Created: 2021-10-05 16:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: faa079c801a3944df9cb1d3cd07789f9 SHA-1: b8592257d004b34d07d50a970a62a12d1059aba1 SHA-256: 5b7f3f78b70e591dba339dfde49bbff4a9e06a242052144addaba33e95c233cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for malicious actions, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://buyyoutubecomments.com/ci/userfiles/files/13634991512.pdf In PDF document text
    • http://ominocoibaffi.it/userfiles/files/46662137839.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/gemunipezinefed.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/91235510012.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/39531502554.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/48519196878.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/90494783208.pdfIn PDF document text
    • https://aaaxxion.info/images/file/95148057866.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/tilaluvazufokefoxosuli.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/43040405646.pdfIn PDF document text
    • http://midospa.com/upload/files/47340677313.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/sodewalobaxud.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/62502090471.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/10297894441.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/76055298735.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/botisuvonus.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/zutaluzufovojigud.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/5335108328.pdfIn PDF document text
    • https://iohrp.org/f_files/files/gavemojuwusi.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/wapagavoluk.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/solikipadubodinutevebow.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/jufutifemuwazakasok.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/vimesadowugavenimim.pdfIn PDF document text
    • https://grnca.org/img/files/files/sufosiwovososofanolaxev.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/48951804789.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/keremoparijigezuvusexo.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/vagedijolaludevisoguzodow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=2d+shape+of+a+conePDF 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_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 20164 bytes
SHA-256: 13f3ea1f6ce672dd2759415b3acf90a6f51801866f53dbd27786324f50119f83
font_02_sfnt_off000142ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AE 10404 bytes
SHA-256: e6c79c34e3c892a7e2f6ab670650f623882e2359757cfad84d6340707d72a1b4