Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a3e164e800088f…

MALICIOUS

PDF

89.5 KB Created: 2021-09-10 07:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3f7bb1a0c6086d4ebbf0fb06568e400 SHA-1: 22b38429dcc4b081abb65c3dbe6808f5e0b9318f SHA-256: f1a3e164e800088ff7636de8153b8b046fe8c49ff2af883546a5b70d6cdec9c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is a link farm hosted on disposable domains, designed to redirect users to numerous other sites. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature of the document point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://bukharajohnscreek.com/sites/default/files/file/58187478447.pdf In PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/tilefisinexus.pdfIn PDF document text
    • http://dmkert.hu/files/file/49674834945.pdfIn PDF document text
    • http://szpk.hu/_user/file/93279953355.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109021642285813.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/jupoditubeladebebipeji.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14594b016---3469713469.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/linevofij.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/88788498722.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/dugom.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/pizato.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f789fa049f---47256030895.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/11588748205.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/nevolalalomupajopo.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/52218757632.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/pifemagudejadikofeg.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/94587906200.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/vapamadivetixakadovoj.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/17502758302.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/lujibipakawevupopitidekal.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/rovetikavuduf.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/bajojesipusetetaladex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=haris+poteris+ir+azkabano+kalinis+online+nemokamaiPDF 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_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 10696 bytes
SHA-256: c6b809ac6c39afacadc100271bcb8c8b1ec5bb7fb1f72f47be5626a3c9328508
font_01_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 21284 bytes
SHA-256: 6d8ca655ac7484f2322dac8856b05022b722dfcb94cd0341c83442657ab42c34
font_02_sfnt_off00013dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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