Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70643419fb17121…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 15:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0f21db651671930346c4688750426246 SHA-1: 80ad894b17477d0a8ca0e66494a5cdf284172bbb SHA-256: b70643419fb17121f144bdc95d83e24238af4f2dcd6a543cd11853a5e364ba2f
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The document body was unreadable, but the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://sjatupornservices.com/file_media/file_image/file/54847137532.pdf In PDF document text
    • https://valenciamaids.com/userfiles/files/vugowizije.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/wasuvete.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/80317878819.pdfIn PDF document text
    • https://invest.pl/userfiles/file/28446862144.pdfIn PDF document text
    • https://partetesal.ir/data/file/74094829520.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/70406208345.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/zerixukebudugazezev.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/91246283833.pdfIn PDF document text
    • http://youil.org/userData/board/file/9211423981.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/zudojataxubezokojoz.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf4809db55---32130757564.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/muridugikonileru.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/649174da0d2a9bb89e4436223a8da231/44149539862.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/sisovebitizeme.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/22942597833.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/fajipivovukide.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/siwalazojoje.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/folumupikurozonujubevitaw.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/xezafuruwadejugawun.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/25492910274.pdfIn PDF document text
    • http://terrietanaka.com/library/files/25811941464.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/xiwosofa.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/wewesexiwajativilurap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=swiftkey+vs+gboard+2021PDF 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_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 17840 bytes
SHA-256: ea5e608896f201174af4fe31bfa02fb244846b6a3d319eade964e41eb5cd1980
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 11244 bytes
SHA-256: 8fd904c5e550322bb4e4611beaa084c862363d0d5d51664076d4ee566664534a