Malicious PDF — malware analysis report

Static analysis result for SHA-256 867c3d9ed7d45ccc…

MALICIOUS

PDF

71.9 KB Created: 2021-01-08 08:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10be162ce74728d344622a34d7d8ac9b SHA-1: ed6bf6298250d311aab78196ef8e6fab9e9a065e SHA-256: 867c3d9ed7d45ccca408a9cfed7f4ee093b3ae861a96c01be66313a31e883541
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a malicious redirector link and employs a social engineering tactic to lure users into installing a fake browser update or extension. This is a common method for delivering malware or stealing credentials. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gettraff.ru/123?utm_term=direct+apk+downloader+firefox
    • https://cdn.sqhk.co/rawejefipemi/khhigb2/vuwabunukojubexivusi.pdf
    • https://cdn.sqhk.co/xewimoziwuvo/hcr3if6/7587067767.pdf
    • https://cdn.sqhk.co/kopizikob/hbW5kIK/94852353022.pdf
    • https://cdn.sqhk.co/dejegekonula/ihhdfRS/father_son_relationship_bible_quotes.pdf
    • https://cdn.sqhk.co/novupezezis/eigNHif/bet_shows_2000s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d330ab12-ff1f-421d-981b-19d8a3a62d45/93863872907.pdf
    • https://uploads.strikinglycdn.com/files/ce1eb501-0da1-45ea-83e4-19f41ffd207d/polk_county_school_calendar_2018_2019.pdf
    • https://uploads.strikinglycdn.com/files/943604fc-bde1-4cf2-ab1d-3b02f7975817/german_swear_words_ww2.pdf
    • https://s3.amazonaws.com/mukut/basevim.pdf
    • https://s3.amazonaws.com/xalexojaxipud/proportional_crossword_clue.pdf
    • https://s3.amazonaws.com/debamijizozexo/halo_reach_laso_solo_guide.pdf
    • https://uploads.strikinglycdn.com/files/4a95ae0f-b566-4033-9119-007a283a9cf3/67843009456.pdf
    • https://uploads.strikinglycdn.com/files/797d298f-09bb-408d-a5d6-9e1937a59b66/95011895624.pdf
    • https://s3.amazonaws.com/betefowubevat/human_ecological_theory.pdf
    • https://s3.amazonaws.com/neviwove/42826558679.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c70c.bin
c305f5de3783c14f4edb1670706cdd732537b3800df02810721ac9cf4e71a3df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC70C 5196 bytes
font_01_sfnt_off0000d8ea.bin
730604712db555f7510bbd0f2c743f54f1fcf722af37ee00347724db415b69cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 10480 bytes
font_02_sfnt_off0000fd11.bin
0122748cd81c8aaef25d06666a31c613375d1a12262b2c358e7cf5fc4fa21ea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 16200 bytes

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