Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1140b829b93e51…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 07:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43e730a4aeee59391ea4e06419a98e7d SHA-1: e9cc14042273d93fc053ad715882708c4f0ed526 SHA-256: da1140b829b93e5168ecd31c96ee160457344c782e485471e6b4d16411e6b1d4
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://topenglish.sk/app/webroot/gallery/files/fewaderugusaxif.pdf In PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/petabasewesotaveri.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109032019426478.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/38950683439.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/7015278654.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/342d041803d2ef6276297709cce46a99/44273586481.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/73583506363.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/86183874781.pdfIn PDF document text
    • http://rhondachem.com/d/files/wuguluvusexajobapojijana.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/29976579668.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/kuzekobake.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/gadejitejusubarumofexit.pdfIn PDF document text
    • http://millecolori.it/images/file/judopuguvi.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/72218639953.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/zowugegamexukunonuxideme.pdfIn PDF document text
    • https://fuoriscena.eu/file/81221093358.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/ziwijuwesetofapi.pdfIn PDF document text
    • https://anakmeong.com/contents/files/netunujosidasaderewi.pdfIn PDF document text
    • http://brenderup.ro/mm/file/votorena.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161331d45c150f---mabaxivabajarid.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/44377385812.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/29956296971.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/tezajitekidifonodalebinaw.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/nuluzimopojabanixem.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/39979697232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=make+money+hack+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_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 17132 bytes
SHA-256: 63e46637f76b95d9d13f11b6078b6168297816bf3f33455b9ad12d7ffd49ffda
font_02_sfnt_off000123fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FA 10332 bytes
SHA-256: 6425845827d5ceac6f74476749424d129f840952d105a32c6c27e9f97053a645