Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bb7661156d8e04…

MALICIOUS

PDF

76.3 KB Created: 2021-01-06 18:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d8022bb771eecda87088e103b8636ca SHA-1: 778b9f671b98cf3a7d2680a4e7e60a2b6dfb6ee0 SHA-256: 20bb7661156d8e04eb39c7587e0e568108b441e3771041046641c978184f3d5a
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The embedded URL is obfuscated within the document's content, suggesting an attempt to disguise its malicious nature. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://gettraff.ru/123?utm_term=manchester+united+fitness+test+results
    • https://cdn.sqhk.co/xezojutatow/gePc59P/78613544718.pdf
    • https://cdn.sqhk.co/pefatipi/jjcp5ge/road_trip_for_18th_birthday.pdf
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5f8c16843c0d8.pdf
    • https://cdn-cms.f-static.net/uploads/4408976/normal_5f9e03bed58d4.pdf
    • https://cdn-cms.f-static.net/uploads/4416153/normal_5fa8b392122ca.pdf
    • https://cdn-cms.f-static.net/uploads/4445754/normal_5fd7b23bed118.pdf
    • https://static.s123-cdn-static.com/uploads/4365649/normal_5fc46ec07214b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/513b96c1-9d32-4d8b-be33-030a2e95c6ee/hotel_restaurant_and_travel_law_7th.pdf
    • https://uploads.strikinglycdn.com/files/33cbd145-7332-48e0-8066-53d0a97e3dbe/information_technology_project_management_schwalbe.pdf
    • https://uploads.strikinglycdn.com/files/b1f16c20-81a3-414d-be58-40b98e4686ed/crucible_act_1_characters.pdf
    • https://s3.amazonaws.com/legesiliv/application_form_for_government_job.pdf
    • https://uploads.strikinglycdn.com/files/fb925626-910e-4008-ab41-ebf57b25084b/50_phrasal_verbs.pdf
    • https://s3.amazonaws.com/zetare/wojomijubawukemonaw.pdf
    • https://uploads.strikinglycdn.com/files/9885d3bc-3ee7-478b-99a7-128637e2b5dd/enamorate_de_ti.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5d.bin
ecb1eccb20d988f11745f08101b762541d1f770311239f2bcf4df301b65437c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 5116 bytes
font_01_sfnt_off0000fdcb.bin
a2b223b22eb450c494df5df9e4c238cd9c4e30a340a2915927123397fb2a9caa
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 11276 bytes