Malicious PDF — malware analysis report

Static analysis result for SHA-256 390527b0a37a9827…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 07:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 81e2c3d284e2cc26f46e1298ef08fc48 SHA-1: 931d17789044dfd0f5a62c94422590890e73334e SHA-256: 390527b0a37a9827fcc37f32582a83db4e96afc644aa42086aace024396c708f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to other PDF files hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and external link behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://hoteldanang.com/uploads/images/files/vokidozop.pdf In PDF document text
    • http://loscogliodifavignana.it/userfiles/files/fapexojajujujoxunobakom.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/12261372458.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/50399490162.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1631080384186611808.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/76773832222.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/xarosiko.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/bebetarina.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/gajutavitezigoto.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109121544199925.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/25365163095.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/71336915498.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/vovofolo.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/70784205158.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/33986601643.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/41907825423.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/69102880440.pdfIn PDF document text
    • http://zenkatsu.dk/files/jepepobipizowujazawij.pdfIn PDF document text
    • https://luminex.pl/upload/file/nanovupagatidutitakexub.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090318042973499.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/xidik.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/3784825218.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/xokejurakafovebaluv.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109042018234867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=whatsapp+application+not+installedPDF 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_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 10504 bytes
SHA-256: dd75ec6c39d68ea5c4a1138975e2c5e19a814344172cf4df8ee7897b886a87de
font_02_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 18228 bytes
SHA-256: 8902eb6460fa0fb30820ce2489a0f71007e58734156dbefbcc370c1cb6ea1463

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