Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a52eb061e77e886…

MALICIOUS

PDF

72.7 KB Created: 2021-09-30 11:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d10205e4850486c736ceaf3af23d5c75 SHA-1: 2703a6ab759e727090dd1076c5dfa6099de5895a SHA-256: 2a52eb061e77e88658b214a0d21b12f5dc5f05d8b94e9fc1ac270e8bdb9954b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure and heuristic firings strongly suggest a malicious intent to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://yaan121.com/uploads/files/202109050214253159.pdf In PDF document text
    • https://clickbox.ro/images/file/81838153419.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/xawefosezazekusaloj.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/80129597502.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/86549213076.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/rutisudidixepimananem.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/69478949700.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/rovopipoki.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/58963664022.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/zobofavezifavenurufole.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/21247732586.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143af4c3bee3---80140581692.pdfIn PDF document text
    • http://rcpolypacks.com/uploads/26248482088.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/feloxatig.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/rivazer.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/zojupoxumemojesebiwamexat.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/29841649446.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/wuvemalolum.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/82200034762.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/77832893320.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16153e381b3ad8---67419353923.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/88651891428.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/74143291942.pdfIn PDF document text
    • http://pasaru.com/upload/files/42619625221.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/16855539806.pdfIn PDF document text
    • http://afslab.asia/upload/files/gezagixi.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/kakefuw.pdfIn PDF document text
    • http://ore-processing.ru/d/files/mitedosarolenavositaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=watch+boruto+dub+freePDF 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_off0000b85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85A 17064 bytes
SHA-256: 7b8c05c7f39e9bf5a585ff3204d8ec93c27da1614cf1c5b3aaacb1fdf1a73421
font_01_sfnt_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 10396 bytes
SHA-256: d5aa10f3ee7d5a389bc388f1472d367960ef54fbec499bffe85d5c6f2c94813c