Malicious PDF — malware analysis report

Static analysis result for SHA-256 02985836d3d187c5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 15:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4fa3b546721dffbde8418d5b457cf503 SHA-1: aeba4a0a0eaadd7196c77236ca10539feb042b57 SHA-256: 02985836d3d187c5c67c730a5e61a442ce1454e401f53a729cad1c879fe1211c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly leveraging JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://librojuridico.com/aym_images/files/gekuxopafober.pdf In PDF document text
    • http://104408017.linker.tw/files/25601194796.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/xakav.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/monuzegesifenizibomabifux.pdfIn PDF document text
    • http://tradotel-riviera.com/file/molamoduxobirizezamasexa.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/rawofona.pdfIn PDF document text
    • https://vpmemorial.net/images/file/81972298385.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109040258561333.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/pusifugurewe.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/237177803.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/zapizunagavuruf.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/28635802733.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/jiwutinijeribolebawixe.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/xazoximuvavabakali.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/1385542979.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210910_041826.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/nibevil.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/watifazezilugutejafakiped.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/56481086952.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-13/20210913135157110697.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/7900269726.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/nokuxojigubomafuxon.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8bf1a7f743b93a54a4016db543660a92/35441836196.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/74012616222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sariaya+quezon+zip+codePDF 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_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 10692 bytes
SHA-256: a1a55041ad1d9cb7b85a2e2d9ba6b6c3471a1c3de85918d687c32539c52866b4
font_01_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 17632 bytes
SHA-256: 2324ebc923ddc6e5be43594b16a202c9c39a09b8d2c0b3dfdb58eb998cc0e544
font_02_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1