Malicious PDF — malware analysis report

Static analysis result for SHA-256 8380edc7b21bc5e3…

MALICIOUS

PDF

75.5 KB Created: 2020-12-29 11:19:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c3e4e9a4fd8e932e3c04060ab482ec2f SHA-1: 979d9ac8e393cc97235da4a6e7e02e935487eb70 SHA-256: 8380edc7b21bc5e36523ee34be2077ba002225c95c2a89f3153a4484c19c041e
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded links, such as 'https://traffine.ru/strik?utm_term=the+walking+dead+season+one+apk+data+rexdl', suggest a phishing or malware distribution attempt. The presence of numerous external links indicates a strategy to direct users to potentially harmful content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/strik?utm_term=the+walking+dead+season+one+apk+data+rexdl In PDF document text
    • https://cdn.sqhk.co/navififoro/hiUijha/miniclip_games_bubble_trouble.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5fab92c42d3c8.pdfIn PDF document text
    • https://cdn.sqhk.co/dijobika/OMsgiGe/kutulesubufur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5f8c22f161c56.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/iiBkjjd/jirex.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/e8631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409799/normal_5fa30de917dd7.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/hgeckmZ/null_vector_easy_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f879a6562f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_5fa0c7cbc982b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b5c698-27ab-4572-9503-8f44f934cb72/51346807146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e54a50-d556-46c7-9905-be49db81fc39/marcy_me_709_recumbent_exercise_bike_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc8cbb4-0ec6-4cae-bf1a-d3400aa9df3a/13692880165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4b6e59-5c57-4920-90d8-291650619547/difomopolibivujozoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b99089-8431-4a6b-9cda-fb2d9771ad72/dash_diet_tracker_1200_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b396ca-a9bb-4627-a6fb-f9592b1ef028/kufatitefu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 5392 bytes
SHA-256: 78e63eec9fd76fef33007ece4dc047fc25e7f88e4414633b8f6e5319e7c8acda
font_01_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 10296 bytes
SHA-256: 7756ffe33663138d326b4a8699ad4d042445664329220ef9fdedfd5d83efda90

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