Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cf8979fdbdf2fb…

MALICIOUS

PDF

97.5 KB Created: 2021-02-18 16:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: db405319e254fd12c213ad0efbdc8653 SHA-1: 16af00dd2c4a72683ee537a3ceaee9bf46e4fa48 SHA-256: 83cf8979fdbdf2fb06c017848ce9a3d62a29406a7904fe4cf82aa7f52bae78cd
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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://yafferge.ru/strik?utm_term=enterprise+data+warehousing+definition'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/strik?utm_term=enterprise+data+warehousing+definition In PDF document text
    • http://reawont.online/103147774565ao2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403428/normal_5ff763fb36318.pdfIn PDF document text
    • http://gogotmif.space/physics_book_for_high_school_student6oymk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469355/normal_5fda08787f985.pdfIn PDF document text
    • http://centerverifybadge.com/houdini_3d_animation_tools_freeb6ng8.pdfIn PDF document text
    • http://yesnutural.space/zukepigilasaxakejuguwiloulej3.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/kuxegu/napasupadulokuranorosu.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/15417368396.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/difficult_riddles_and_brain_teasers_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/33238809102.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/discriminant_function_analysis_reporting_results.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/postman_6._7._4.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/cb_background_full_hd_new_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/vintage_animation_sheet_crossword_clue.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001319f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319F 5320 bytes
SHA-256: 870d8227023870c079232f664d171da8fa79cafd2d5ec5db5ed1f8722f98686b
font_01_sfnt_off000143cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CB 11208 bytes
SHA-256: b769868ad3c526874b7c0c3dfed4c5cdbb1d16bde2144a16992b58c55d75e144
font_02_sfnt_off0001698f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1698F 6084 bytes
SHA-256: 0c3766dce408445f50e904d652c9326647873efe4fb22fffa238fb744f3c79a9

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