Malicious PDF — malware analysis report

Static analysis result for SHA-256 f263e6bc81f9b4e8…

MALICIOUS

PDF

70.6 KB Created: 2021-03-30 14:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23d8b1e5ffc75bac005ce99c5b339435 SHA-1: bdcdfdf4caadfd73dbbd384228845abd574dc8f9 SHA-256: f263e6bc81f9b4e87da1d263a3d6c165ad0cb70718e38fce2bbbdefbdb47d88c
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'dafemum.ru' suggests a phishing or download lure, disguised as a free PDF of a book. Although no scripts were explicitly extracted, the PDF structure and embedded URI are strong indicators of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://dafemum.ru/strik?utm_term=habits+of+the+creative+mind+2nd+edition+pdf+free
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdf
    • http://dabutaxezopis.iblogger.org/hard_difficult_hidden_pictures_printable.pdf
    • https://cdn.sqhk.co/suxepemup/Pu7Oogg/jopewipejaja.pdf
    • https://static.s123-cdn-static.com/uploads/4489257/normal_6002065da3ade.pdf
    • http://dudosawiroti.22web.org/32303807488.pdf
    • https://static.s123-cdn-static.com/uploads/4463286/normal_5fc9c078c773c.pdf
    • http://libidisebosuv.22web.org/55219251977.pdf
    • https://static.s123-cdn-static.com/uploads/4412161/normal_5fec5812dae2f.pdf
    • https://cdn-cms.f-static.net/uploads/4370740/normal_60618a6441b43.pdf
    • https://cdn-cms.f-static.net/uploads/4459628/normal_60225cfd4ad8a.pdf
    • https://cdn.sqhk.co/vizakifito/aXieY2T/2017_juco_football_recruits.pdf
    • https://cdn.sqhk.co/zumedizojas/jhyghJ6/27813904581.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kodadus.epizy.com/45969003575.pdf
    • https://s3.amazonaws.com/batoragubukepo/zugupa.pdf
    • https://s3.amazonaws.com/lusabifef/94724384805.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/guideline_value_coimbatore_keeranatham.pdf
    • http://sadisuden.epizy.com/digirofarokawu.pdf
    • https://s3.amazonaws.com/resixexi/destiny_agonarch_rune_guide.pdf
    • https://s3.amazonaws.com/pibajuwi/is_the_total_gym_good_for_osteoporosis.pdf
    • https://s3.amazonaws.com/levumoduf/ranewozotirexiko.pdf
    • https://s3.amazonaws.com/sepawi/kamodogebibi.pdf
    • https://s3.amazonaws.com/wegemebufojafak/iracing_sprint_car_template.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f6.bin
40bb3b1dcfa9afb3ed18d596942ce7add3f57db0124db3031a2a9c43abe814da
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 5656 bytes
font_01_sfnt_off0000ec0a.bin
c934b8c4f2bc528d6a9bf2b997086e2bcbd7eedbfce10f98717f2e1135d31162
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 9484 bytes