Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c78acae453d9d6…

MALICIOUS

PDF

73.6 KB Created: 2021-01-06 14:37:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: feb8975a4896d89816a2692aa8588780 SHA-1: cef9731ab7a271790a627c5c389e20079f698b5d SHA-256: 52c78acae453d9d6d85e369ac6a57868d8e53f138d408275456f23211db60eb9
214 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with text related to credit report collections. This suggests a phishing attempt to direct users to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://gettraff.ru/aws?utm_term=how+to+fix+credit+report+collections In PDF document text
    • https://static.s123-cdn-static.com/uploads/4451369/normal_5fc4c0b3bd976.pdfIn PDF document text
    • https://pifujikis.weebly.com/uploads/1/3/4/8/134875168/8be8bcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f89363266bed.pdfIn PDF document text
    • https://siropenisawad.weebly.com/uploads/1/3/4/3/134353493/3803239.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4caeef50-9e9e-47fe-9cb0-050a036b3f6c/coral_isle_builders_complaints.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/73066225341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62cc27a4-9df3-486f-a71d-9fa922e05cd8/fubuzilopubo.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/12276836996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd74cac-035a-4b36-b8c3-ca2e54422a9f/pressure_cooker_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a07ba8de-0c15-4957-87db-34c4c50cddcb/ethem_adnan_mp3_song._ergil_kimdir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e649f6a9-8e44-4871-87c6-a7e46d7105ab/25649534667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4de054c-9eae-4ebe-a50c-16267c09483a/48365331795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743eaf31-6419-42b3-9fc5-92d64ca8640d/buzowanarinuzajozuwob.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/32088783177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90a5e141-9b2d-42ee-bdcb-0e75aa0f7ca0/bristle_woods_rift_journal_theme.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/33936028995.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/email_writing_format_samples_class_10.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 4848 bytes
SHA-256: 050b3490f6de3500a54e8ab3f2328af5078ebb664d543fbe6eae40cd7a359f25
font_01_sfnt_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 10436 bytes
SHA-256: cc02cf6aa81e11e914770d72b84c88ea4f3db8b5665559dc177c6d1a673f1366
font_02_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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