Malicious PDF — malware analysis report

Static analysis result for SHA-256 2909b02cd2c874ef…

MALICIOUS

PDF

77.6 KB Created: 2020-12-26 03:01:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69f594d693652008177f8d425615eb7e SHA-1: 2c7c8a98a550e6cbaf227cce4aabfa218427b6c5 SHA-256: 2909b02cd2c874efe7a3cbfe89e05558c0e3a7650c8f25454941e22d861a533c
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, many pointing to external PDF files hosted on various platforms, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=idle+coffee+corp
    • https://cdn.sqhk.co/papusabefo/igPHiaX/psx4droid_bios_android.pdf
    • https://tufiganifipira.weebly.com/uploads/1/3/4/3/134310976/2621060.pdf
    • https://cdn.sqhk.co/fasixazijaz/dtAogeg/nitizizitutibumarofune.pdf
    • https://cdn.sqhk.co/kakumipoman/Sghih9j/social_media_marketing_certificate_online_free.pdf
    • https://letuwolisabir.weebly.com/uploads/1/3/4/6/134602086/dirabupuv.pdf
    • https://cdn.sqhk.co/zipodumup/hcMjeDh/forest_hd_wallpapers_1080p_download.pdf
    • https://cdn-cms.f-static.net/uploads/4491946/normal_5fad5fcba9626.pdf
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/fudezudubedulo.pdf
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/wevalatomexiwol_vapival.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rijaliwiguvex/10598477827.pdf
    • https://s3.amazonaws.com/zabejuvijolu/powerpoint_themes_medical_free.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de0c.bin
9696d93b1c2f15c176e7c07bfc2518e1f7549f0d5ba5511562e8a44382cc657f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 4252 bytes
font_01_sfnt_off0000ec73.bin
3f019984cfdfe6c84274c7669782eb41d5b5f4473003a8ae79e5f286dfbd04e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 2252 bytes
font_02_sfnt_off0000f6b3.bin
0b3d047d80f0fa4ef8d0ab55b2be873ffdc0ff6bbb4481635fdca250b85b135a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 10708 bytes
font_03_sfnt_off00011b14.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 4324 bytes

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