Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2c58f323ea3e3d…

MALICIOUS

PDF

83.3 KB Created: 2021-04-27 20:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b37d103422e0d5ffc2583b065ec7bc1b SHA-1: 67947d961521c378c2339ca4b4c84bdecf44c280 SHA-256: ef2c58f323ea3e3d8be66b17154f2986daebab5635b856ce5febdaec24df2d26
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to SEO-optimized content, suggesting a link farm or phishing operation. The primary URL, 'https://druttle.ru/strik?utm_term=best+place+to+learn+forex+trading+in+nigeria', is presented as a lure. While no scripts were directly extracted, the PDF structure and numerous external links, combined with ClamAV and ML detections, strongly indicate malicious intent, likely for phishing or scamming purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=best+place+to+learn+forex+trading+in+nigeria
    • https://static.s123-cdn-static.com/uploads/4415951/normal_5fee82ab433d5.pdf
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fd30d9eaf1ac.pdf
    • https://cdn-cms.f-static.net/uploads/4490116/normal_6027d7f581f62.pdf
    • http://lnstagramsupportingcenter.com/81568970218rcae2.pdf
    • https://notagudoda.weebly.com/uploads/1/3/0/7/130776089/802a466cef3e48b.pdf
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/2787260.pdf
    • https://kurexutolik.weebly.com/uploads/1/3/5/3/135350225/tadimaxumiwawi.pdf
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/makeb-nowisinusib.pdf
    • https://cdn.sqhk.co/bumadawab/fEdlifd/rival_stars_basketball_mod_apk_download.pdf
    • http://merishwheelrecords.com/62007856136xka4s.pdf
    • https://wepejusekubikur.weebly.com/uploads/1/3/4/4/134441987/b38eb911c8.pdf
    • https://cdn.sqhk.co/kavejufa/hjiagfM/16722534526.pdf
    • https://cdn.sqhk.co/bubuzibiv/giieEGS/66965899589.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lanubili/puregidej.pdf
    • https://s3.amazonaws.com/gizonukorad/18143933130.pdf
    • https://s3.amazonaws.com/zerejibixupav/iomega_storcenter_ix4-200d_custom_firmware.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/pilitovut.pdf
    • https://s3.amazonaws.com/kiwopusafize/45642287974.pdf
    • https://s3.amazonaws.com/wemofodi/receipt_voucher_format_free.pdf
    • https://s3.amazonaws.com/vukujidor/cooks_coffee_maker_reviews.pdf
    • https://s3.amazonaws.com/rujimidujek/datasheet_ne555.pdf
    • https://s3.amazonaws.com/xowasosuf/vunudekonazivuvukuf.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/85077598355.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f785.bin
2fa348a57c8615a72abf3a14013957e60ac18b8430ad97e007f7a8d8f2488478
pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 5228 bytes
font_01_sfnt_off00010962.bin
51a56f5cbde9231ba45b5c8f9f548190d013a1eb6aadcd2311a5edd9afed9952
pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 11108 bytes
font_02_sfnt_off00012f35.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 4324 bytes