Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa218e67c7f3c41…

MALICIOUS

PDF

86.1 KB Created: 2021-09-18 11:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83ff01b850c4a9d0634d138221c02f98 SHA-1: e035f0dafd4631b895cd44df0ddcfba9214b4707 SHA-256: 5aa218e67c7f3c41451155b8437cd2e177713eaceb435450da3d2599ac0039fa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. The presence of numerous external URIs, including a link farm on disposable hosting, suggests a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=merchant+of+venice+important+questions+and+answers+pdf
    • https://espiber.cl/images/uploadedimages/file/papusujoranajosaxomez.pdf
    • http://alothongtin.com/upload/FCK/file/60687734242.pdf
    • http://t-p-fortune.com/userfiles/file/gosaso.pdf
    • https://topclassgardening.nl/images/file/64905931697.pdf
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/fufegabakeg.pdf
    • https://cjsc.se/ckfinder/userfiles/files/46335792601.pdf
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/54183968483.pdf
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/taseruvigov.pdf
    • http://tdjl.com/uploadfile/file///2021091323040940.pdf
    • http://f-kcc.jp/user_data/userfiles/files/nomerinofuwivonin.pdf
    • https://ancoraeducacion.com/images/ledukovor.pdf
    • http://candleelectricals.com/uploaded_files/userfiles/files/mubajelarokubevos.pdf
    • http://kfoodntea.com/dataroom/file/pifemudetamujotuvaxag.pdf
    • http://osteriadelcampanile.com/userfiles/files/91496604744.pdf
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/gatigerokuneduladi.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/26420cf01cc34c14c743ed5dac0efa83/74778476378.pdf
    • https://littleitalypizzany.com/nbloom/fckuploads/file/zirojixitubitudejeguso.pdf
    • http://yizhu580.com/ckfinder/userfiles/files/garav.pdf
    • https://mhreng.com/userfiles/file/87027842963.pdf
    • http://studiogiamberardino.it/userfiles/files/54164046239.pdf
    • https://madame-tina.com/ckfinder/userfiles/files/dakopasinakomixekapovu.pdf
    • https://purmoradiatoriai.lt/images/files/diwabulekem.pdf
    • https://alariel.be/userfiles/file/87301204566.pdf
    • https://kubermatkaplay.com/ckfinder/userfiles/files/5342602788.pdf
    • 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_off0000e992.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 16792 bytes
font_01_sfnt_off000101a9.bin
1a74d20bf66de94c74f4fbca24355b45c5e401aa7b1a313f5dbad625c8f40934		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 11228 bytes
font_02_sfnt_off00011ba8.bin
bcb5e07c8bd31a303c90d0afad111264348b4f59b17cec76ce8cd91d59fdff02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 17724 bytes

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