Malicious PDF — malware analysis report

Static analysis result for SHA-256 839053ac6c538303…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 15:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c636a7e8243aa552c5fdd047c588499 SHA-1: d32bd51884828c3bfeddfd680af2c740aab327cb SHA-256: 839053ac6c5383032dbf475e83e57308c44f053863d99eaa82b8af1ac6036930
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially compromised websites, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users through multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://salonmysliwskirys.pl/userfiles/file/9493698001.pdf
    • http://ceskylakros.cz/userfiles/file/gomufomiwamepe.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/fomuduwejelutadinebojaj.pdf
    • https://ngonluathan.vn/images/ckeditor/files/31362933520.pdf
    • http://maihome.hu/admin1/file/7114746467.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/jazireresufodasovapukiwur.pdf
    • http://ozdesignhouse.com/app/webroot/uploads/files/jetirodaxisa.pdf
    • http://resortvillairene.it/userfiles/files/leburufapejojujigazebe.pdf
    • https://oriontradecom.com/ckfinder/userfiles/files/53944449716.pdf
    • http://holidayservicemarsala.it/userfiles/files/lomalofuxudiluximenun.pdf
    • http://astmasme.com/userData/board/file/litopavizutilidupewo.pdf
    • http://forumts.com/ckfinder/userfiles/files/40105705756.pdf
    • https://creteotels.gr/FCKeditor/userimages/file/51705121381.pdf
    • http://tranindo.com/Uploads/userfiles/files/sakepatitejagupe.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/pjtvvo30l2d0i18plmje942su4/87106501397.pdf
    • http://botaierpharm.com/upload/files/biwevodazuwudufiw.pdf
    • http://weorderfood.com/uploads/files/sezomumezexogaf.pdf
    • https://koratspring.com/upload/file/39082845444.pdf
    • http://frigotechreina.com/userfiles/files/fepuveseruvekup.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613689e0a3164---4731088388.pdf
    • https://sukhayurveda.in/userfiles/file/75550525138.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gaga+lite+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96d.bin
df9918e43ec0b9f663ffcf5a487b854dafab64905f4cb79b03e5961d1cdf4444		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 18544 bytes
font_01_sfnt_off000109f0.bin
87a4754d0556bb25d82f9f6242974124ed8491c3e91950a0975c38c9676563d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 10064 bytes
font_02_sfnt_off0001207a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 16792 bytes

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