Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5d38a2f511dcf1…

MALICIOUS

PDF

70.1 KB Created: 2021-01-09 07:16:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: df29846cfc86147ca35c49b5a5b979cc SHA-1: 48148bf38970447c13d57a51c7c02e739dc6052d SHA-256: 0f5d38a2f511dcf12e665135802a1aecdb114629cfca1b2d142ae58db0fa4fd4
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded URLs, with at least two identified as potentially malicious redirectors or part of a link farm. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to external, potentially harmful, sites. No scripts were extracted, but the PDF structure itself facilitates the malicious linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • 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://traffking.ru/aws?utm_term=aditya+varma+bgm+free In PDF document text
    • https://kazenoti.weebly.com/uploads/1/3/2/7/132740362/5248066.pdfIn PDF document text
    • https://cdn.sqhk.co/feledigowud/jcmhjgf/nail_salon_with_hello_kitty_chairs_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5f9d9335de283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5fe8f8e280247.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/ijiaXfc/ghayal_once_again_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/jayNghJ/85052668138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379973/normal_5f8cc4f8cc0b8.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/sedowedi/vegul.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/kewakulo.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/muslin_crib_sheets_boy.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/85143074147.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/zezajenujobuvexokazogimuz.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/minecraft_witchery_mod_tutorial.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
    • 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC692 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000d777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD777 5308 bytes
SHA-256: 0278455d9faf1b84a4e612bcbbd30a80e16fb289f3eaddd803a1585ae9ab8870
font_02_sfnt_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 9800 bytes
SHA-256: 9880ec5c6b435496857ba314cd670631079df8f2b437d529b91a86799d3cc221

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