Malicious PDF — malware analysis report

Static analysis result for SHA-256 be910e47e405afa7…

MALICIOUS

PDF

93.7 KB Created: 2021-10-07 05:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 187c4fb5be76889c41111fe23df1b410 SHA-1: ada1050c6173e23e3730cb7f2d602a3b5540f0e2 SHA-256: be910e47e405afa7640439723f650186a60fa211ba232a97cb57ba511d3cc45b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://garglob.ru/uplcv?utm_term=how+many+years+does+a+bachelor%27s+degree+take PDF link annotation
    • http://architects-desk.com/uploadsfile/78077126870.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/87389080050.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16146f458a3d50---55234649665.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/guleruvemux.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/pimuxelewi.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/jegud.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/36044276141.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/14129749286.pdfIn PDF document text
    • http://insp.biz/img/file/zemetatamexesaf.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/bevamezufininuwotekas.pdfIn PDF document text
    • http://millecolori.it/images/file/fojowu.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/nuruxa.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/sinazonu.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/rurajuzobeguj.pdfIn PDF document text
    • http://ds-dq.com/uploadfile/1633156498.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/kegefewemazusab.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/75796707490.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/gesakofopirulu.pdfIn PDF document text
    • http://pk.mo/userfiles/file/44252709885.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1i8738kc84u84en3li49quuomp/84007821501.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/pogononikupaselir.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/vimirefizazenabodar.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/46032627738.pdfIn PDF document text
    • http://synfarm.com/upload/files/26960733713.pdfIn PDF document text
    • 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_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 11180 bytes
SHA-256: bf84ccdb874e642214645797900a95cf8d73326f38d8f7e6f67f209f209408e8
font_01_sfnt_off000120dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DC 18640 bytes
SHA-256: f73c8b524305593dbe6e77a90ab76e153fff14f037459dc1872983be8984a8ab
font_02_sfnt_off000150b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1