Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b2ad0f8a1b808c…

MALICIOUS

PDF

68.0 KB Created: 2020-12-07 02:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f36078d29232124c4ad09f8f5d3eebfc SHA-1: 79e0853b2fe857c32b2ef510fe067e8e8fd6ead3 SHA-256: e8b2ad0f8a1b808c88d0d9e97a92ff0085c6e0b3314d46357a52687f592a8a15
214 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The presence of a large number of external links suggests a link farm or redirection attempt, likely to facilitate phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=horizontal+integration+apush
    • https://vuguzunorofina.weebly.com/uploads/1/3/4/3/134322364/merofetilaj-nogodapinola-midexib.pdf
    • https://worubagazew.weebly.com/uploads/1/3/4/6/134639575/9051844.pdf
    • https://busaluvugisegiw.weebly.com/uploads/1/3/4/3/134368440/koker.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf57a0e18c5c478ef3152a/1606375330501/well_being_center_ardmore.pdf
    • https://uploads.strikinglycdn.com/files/994f3dfa-ee92-4932-bde1-d39ac4a62db2/26934015822.pdf
    • https://uploads.strikinglycdn.com/files/2ea22317-c2f0-41cd-bbb2-848fa33ec780/rogers_middle_school_prosper_bell_schedule.pdf
    • https://s3.amazonaws.com/wonoti/6633321745.pdf
    • https://uploads.strikinglycdn.com/files/bb897879-689a-4a96-a117-64cb15b828ed/39871810458.pdf
    • https://s3.amazonaws.com/juduk/21126913701.pdf
    • https://uploads.strikinglycdn.com/files/3d88489b-518e-45ee-8e54-1df875af70d5/1978_oldsmobile_cutlass.pdf
    • https://uploads.strikinglycdn.com/files/f1c9479c-0108-4273-a419-61bb5b2d4e17/duturagexozejagominobitel.pdf
    • https://s3.amazonaws.com/doxifuba/s_y_c_ka_full_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2b6.bin
573a2267e75cb4519f97265befde1f25e31cd71d783b2a7c6d122362e40e0e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B6 4972 bytes
font_01_sfnt_off0000d395.bin
3c26b88db498c2497a8e403b605c0c423725af9ab6a06509a0fc66fe16792304		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 9908 bytes
font_02_sfnt_off0000f58c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 4324 bytes

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