Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77dada797fddc06…

MALICIOUS

PDF

95.2 KB Created: 2021-09-13 10:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6adee2cc69b5564fb5995f360609fa87 SHA-1: b8c6d6c8e489892b250f1b11d66b61485965e3c0 SHA-256: b77dada797fddc06aecbc05c264065fd287cef4a5e343efef716663c0fe94be5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a link farm on disposable hosting, with many distinct hosts and UTM parameters, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the PDF structure and numerous external URIs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 https://dynasty888.com/image/files/20210904_010617.pdf In PDF document text
    • https://rugsinc.in/UserFiles/files/xuligopipigemeritajawuje.pdfIn PDF document text
    • http://lukinserv.hu/file/gadaloz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/womowemuximerowibusozi.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090922524373499.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/42924349150.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/31320195758.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/konobekepuzavuxojur.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/60164059617.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/68285249031.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/49367606930.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/samuvi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4af02f7f5---34376179445.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/badajovetitaz.pdfIn PDF document text
    • https://beaszemin.com/files/50256520716.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/lesebexebatunebikufo.pdfIn PDF document text
    • https://derfo.info/resimler/files/takebono.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/26989038065.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/xapanufemurije.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/fofajolekijasebonema.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/luvelemulosisawel.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/dogawijoxorelol.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/varafegeviruroxebune.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/45012505456.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/zozugopuziveb.pdfIn PDF document text
    • https://kaparatt.com/images/File/21098071635.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/tarikuridoburapunorum.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/dekel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+beta+download+apkPDF 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_off00010bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 19500 bytes
SHA-256: 23f8bdad18b27cce1308e7bda223b6b34a4d4cb6439afd04cad492cff77d4654
font_01_sfnt_off00013e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001567c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567C 10756 bytes
SHA-256: e770c400fa63328e28d83ac2ffbaf86e7a4e3486a33f93fc5a0d8f2e73282609