Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a66667a5639ced…

MALICIOUS

PDF

70.0 KB Created: 2021-09-15 17:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3844ed94a1d78dd12db78f2a5691ecdc SHA-1: a4b78e298a26e47f9f678a5a3cecd6333c922c29 SHA-256: 03a66667a5639cedf5ec7ca3f5b66779ee5679d2c1dfff3d5321a6c0493212ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing operation. The presence of external URI heuristics indicates attempts to redirect the user to external content, likely to download further malicious payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://clinicaveterinariagussago.com/userfiles/files/3797783464.pdf In PDF document text
    • https://contact-house.com/fckeditor/upload/file/17009322637.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/84625478980.pdfIn PDF document text
    • https://okazionche.com/files/wepelefaxotavobejugisesu.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210910131314.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/ginidolaloleboriwen.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c11e25dca---46846686981.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/72250298793.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/lf2ii0dfkql7i1lmct2bfgb2g1/befamiwawukipafimofapafux.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/lofof.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/37821580235.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/29350404302.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/buvolimiwatofofowa.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/34932454041.pdfIn PDF document text
    • https://terracell.info/images/file/29915463957.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/rotejuvudowigup.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/widezitobud.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/71778046996.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_21_38_30_8625.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/nutetuzudadewad.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/68906376041.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/pubuw.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/garefigivabujotaxel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+game+naruto+shippuden+ultimate+ninja+impactPDF 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_off0000b16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16C 15184 bytes
SHA-256: da7a2bdc5cba46d5a2cc1f70992acdfb87589dc83bb456d9b6d7aabbcc76c0a9
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 11276 bytes
SHA-256: 4a66f7edaf035646e09023a1c678bb7cf4fce55f79530c35d21a8b67fabef800

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