Malicious PDF — malware analysis report

Static analysis result for SHA-256 02511f0f576e40fa…

MALICIOUS

PDF

77.3 KB Created: 2021-03-21 07:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b4a8c8aa864c96f532ed8f46dea6f7b SHA-1: 48e1db4ea43049fff79d867e847edf77acbc199d SHA-256: 02511f0f576e40fa8e44d5382e443fbd8eaa2a076408ffb2274afbbc69db21ce
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, suggesting a link farm or redirection tactic. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate potential for malicious content delivery or phishing attempts, likely initiated via spearphishing.

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://jacksth.ru/123?utm_term=cpt+code+for+ultrasound+guided+iud+placement
    • https://cdn.sqhk.co/xagaxubibiz/ji9HjgY/city_racing_3d_download_for_windows_10.pdf
    • https://cdn.sqhk.co/naziwixolagu/JCjhhjd/nevupebakivawikadagu.pdf
    • https://cdn.sqhk.co/lepudijazur/t8jj4hj/marketing_director_salary_range.pdf
    • https://cdn.sqhk.co/memukodafum/F4STieY/pathology_case_report_template.pdf
    • https://cdn.sqhk.co/jewipabefoji/iqMlhfE/bobasozupovaves.pdf
    • https://fukusegoboviv.weebly.com/uploads/1/3/1/8/131856281/3440604.pdf
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/tuteroguzugi.pdf
    • https://cdn.sqhk.co/riraxizilob/bF0hig7/digital_marketing_certificate_online_cornell.pdf
    • https://cdn.sqhk.co/bemememu/csImgfp/71858043730.pdf
    • https://cdn.sqhk.co/wogirujut/Ajijggd/34673509799.pdf
    • https://cdn.sqhk.co/luwesefizi/cbtkHgC/99004168501.pdf
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/5091585.pdf
    • https://lumigoxodavi.weebly.com/uploads/1/3/1/6/131606620/a1d3aa1.pdf
    • https://cdn.sqhk.co/susojitigi/hcgeghF/73816372396.pdf
    • https://cdn.sqhk.co/togodawexu/hggSij0/island_defense_wc3.pdf
    • https://cdn.sqhk.co/pimibopugugo/geggnhe/33024398542.pdf
    • https://cdn.sqhk.co/rilixuzewiv/iAjbiHh/spiritual_quotes_on_faith.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0404cab7-c021-4537-be79-420bcb2f88cc.filesusr.com/ugd/52c240_a9f6885553d04d02a3d2f633bec8bdf0.pdf?index=true
    • https://s3.amazonaws.com/marimejerebo/20758329478.pdf
    • https://s3.amazonaws.com/gopifu/6664362582.pdf
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_e6c00b84dff84f849d97223ecac5f44c.pdf?index=true
    • https://s3.amazonaws.com/kuxuxemu/safevep.pdf
    • https://s3.amazonaws.com/gazivemon/weather_report_for_fairport_ny.pdf
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_686e1fbc088c4ee8994b9a1938c55639.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0fc.bin
08d59c4cc9f5e2d2df9f3c8e086674f589544eb9602ce4a702aa6632e586b2ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 5380 bytes
font_01_sfnt_off0001032c.bin
1b0e6a60f20df564027c61dd4ef9944454cb5a52df626626728b367bebe30bf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 10620 bytes