Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ae3beafd7937a4…

MALICIOUS

PDF

71.9 KB Created: 2021-09-14 11:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 770d558f51a8b826d67b15cf2accabc0 SHA-1: 78b928476aa3c98f588014621ae9dc46f4e4be6b SHA-256: 77ae3beafd7937a4f3d48ad1d56a9780be34e9cb9bb0b0599abedfab417c92e7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://faithleader.org/js/ckfinder/userfiles/files/72426214426.pdf In PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a41733a7---96003965422.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132870e632ef---49305724371.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/29411946977.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090119575373499.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/nevolezuviw.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/noxisisofenibopowore.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/94484819847.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/kedibalidoxiz.pdfIn PDF document text
    • https://dcimx.com/files/75248390035.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/pavaxekakijujureto.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/lizetipiseruvara.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/wivaje.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/betatufapero.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/gamomapovetiwoleb.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/sumimofafimevilipabifarej.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/gagudilimirajirosetar.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/65295485096.pdfIn PDF document text
    • https://stvorki.ru/files/file/jivupurepaxoxedolevujiram.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/ripul.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/85013351771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mons+camp+mod+apk+unlimited+moneyPDF 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_off0000b6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0A 16348 bytes
SHA-256: fad9c3605b8c331207e11e45f4c8f40a8e842ce8197dc0446ca2258c3c21b461
font_02_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 10876 bytes
SHA-256: 1cd7bad00c51a2fb1fffe9d965cec5a2272599fa5d97109c036e0d74dfdcdda8