Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c755d4e303c20f5…

MALICIOUS

PDF

82.3 KB Created: 2021-03-02 13:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 65d2bf6a78721101b87d8122acc8a4a1 SHA-1: 3ee90fbf0b026ecf9959898c40f794173957fd42 SHA-256: 6c755d4e303c20f51ff5dd0053e8eb53e1b4b3de839811ac197fbcf86b020f3b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://dafemum.ru/wix?keyword=bike+race+all+bikes+unlocked+apk'. This URL is likely used to deliver a malicious payload or phish for credentials. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/wix?keyword=bike+race+all+bikes+unlocked+apk In PDF document text
    • https://cdn.sqhk.co/tezofugowura/hchjwjc/spinning_knife_blades_mod_apk.pdfIn PDF document text
    • http://ponezivugatub.22web.org/5491407037.pdfIn PDF document text
    • http://gisomog.iblogger.org/53382255485.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/dgigjib/vello_d_oro_taormina_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/runorefokavelifi.pdfIn PDF document text
    • http://xoxemofunox.epizy.com/format_factory_full.pdfIn PDF document text
    • http://zidufixeda.epizy.com/apush_chapter_2_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/how_did_the_kid_in_stand_by_me_die.pdfIn PDF document text
    • http://nenigira.epizy.com/38219305876.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/eleven_sports_program_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/stillness_speaks_eckhart_tolle_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/fmea_tool_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/medscape_apk_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/disgaea_1_complete_strategy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/fafefer.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/plantronics_backbeat_go_2_wont_connect.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/12468476153.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 5320 bytes
SHA-256: 03512733accaf12d4314905185a11dbb3343f6a567988a76f6ed888dfb1bcd37
font_01_sfnt_off0001178a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 10704 bytes
SHA-256: aaf4a3b96bae9ef732e91f179a55045ed05b6f1552f7613848cf955abd995cd3

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