Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86b813049c11081…

MALICIOUS

PDF

62.8 KB Created: 2020-12-17 06:18:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2ddee4ea435bb6539acfbd98b226e941 SHA-1: 7e40402cf368bcc90bae6a77d16545e87d6dbf88 SHA-256: e86b813049c110813529031b83960ad804c28956c3b9efe732006bf8079d8631
174 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to traffking.ru, indicating an attempt to phish or deliver a payload. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the malformed stream length heuristic and the presence of a malicious URL suggest active content designed to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/strik?utm_term=beau+rivage+concerts+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426814/normal_5fb966423d99b.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/d1b754d49938dca.pdfIn PDF document text
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/dumatopuwixoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413850/normal_5fc13137d9bdb.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/d96ac2bf-fa8d-4fca-82cb-749d7854fe61/fejomudelopedixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb84f77-fe56-4a37-b9f1-ad70ad09185a/25756599001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6c1913f-e2f7-4020-9dd3-2e2e5c4d9e15/texas_driving_manual_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/88074437559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b66a30-1587-47e3-808b-f55a06dd5f98/thor_i_knew_it_gif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32162a69-9e85-4811-a291-cccd25470981/91452322001.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/invitation_template_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/intramuscular_injection_administration_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b821c83-b95b-491a-8fb0-1b117fa5a3d6/93061990775.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/vejunivuwevojabobokidu.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/job_appointment_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c969e8-c4a6-4ad9-8390-6c38092e9b18/saxotijadurunake.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_off0000b94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94B 5528 bytes
SHA-256: 785cf7e8177a1ee7ad7bae9324cd319553ecbbfcbead85fcfe8670d8b2df0b11
font_01_sfnt_off0000cc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC33 10084 bytes
SHA-256: 3c339498056540379235ce3127ec83578c897bbeb42cc36aae0c59cf0033865f

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