Malicious PDF — malware analysis report

Static analysis result for SHA-256 688ccc19877f8f91…

MALICIOUS

PDF

74.2 KB Created: 2021-10-04 15:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6e0e7fc85385b3b372c9e59e9dfbe885 SHA-1: 0734b2dd1dd99a6990f0d0555497ac4a9904ddf8 SHA-256: 688ccc19877f8f91e41ffd370ae3f9acec6ee4b1468033f84d3630b2c69b79a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The presence of a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=bump+on+back+of+ear PDF link annotation
    • http://noithatmyhome.com/img/files/67749500392.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/zageke.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/78257740098.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/tifapisawugimofodulisol.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/j2msluh3r9c4epfanlhgfb5vct/30865317428.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210914185016.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/47618491557.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/texuxomesijufolevifimatuf.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091605355070554.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/82753616467.pdfIn PDF document text
    • https://russiancosta.ru/ckfinder/userfiles/files/4335027771.pdfIn PDF document text
    • http://eko-uklid.com/files/file/69866779001.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/24792349882.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/51125337300.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/zivif.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16149d97191be0---7154418826.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/47921849085.pdfIn PDF document text
    • http://modtre.com/fckeditor/editor/filemanager/img.php?file=file/tolefewupigojozotarupiju.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/buxurewutopuguganugu.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/59015971118.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/turaxelokamixepetafakeben.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/10/file/zikovegiwefujipede.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/62620982304.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/38539115152.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_off0000bf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 16940 bytes
SHA-256: e8f83ad1622369a132d53566c8c8ebb925ba5c841857f9124f66a76d1534c693
font_02_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 10620 bytes
SHA-256: 6a57b505ff63b7f905dc811ad053b5ac8aa9aa5759aa49c5c091e54411c985ad