Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ed02071d281ec3…

MALICIOUS

PDF

96.2 KB Created: 2021-10-07 10:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a224f0e66aaae4e7b990c460f9088155 SHA-1: e4e670556b29e6ee74c04ce6cf9712ff5d59ffae SHA-256: 86ed02071d281ec34487910db91dfadfe17a6f1a57d02a4846050214effab98c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=synthesis+paper+about+natures+number PDF link annotation
    • http://bjxbw.cn/userfiles/file/67206856050.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9eda462d8f98c3c098c4f9920baff4af/pagasemafekuxuvafa.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/zijivonupos.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/japawel.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422c316ffcf---27125182557.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/13880040067.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090704361173499.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/lifezugigejawaxoliseputap.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/33160839336.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/52009646522.pdfIn PDF document text
    • http://xinnethk.com/userfiles/file/senatazukodigupike.pdfIn PDF document text
    • http://gnox.vn/upload/files/67961706022.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/18676463345.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/22440003868.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/wokuvarebej.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/79865622256.pdfIn PDF document text
    • http://www.miwon.com.vn/app/webroot/uploads/files/vujegilepokav.pdfIn PDF document text
    • http://deltools.com/userfiles/file/fulagebosusagovaxume.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/veziworagekuborebek.pdfIn PDF document text
    • http://htygroup.com/upload/files/lavifunasowevele.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/68192455751.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/15476720222.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_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 21620 bytes
SHA-256: c89bc0b2d8ae663f46379522800a7fb4d812b127918133b3c722ce445295e602
font_01_sfnt_off0001425f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A76 10900 bytes
SHA-256: 939bb5e65ab675926c38ecb78d68c40b557b2fe0c92e79b9ac31fa44fbfb8fcd

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