Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8b865e585dbb71…

MALICIOUS

PDF

85.0 KB Created: 2020-12-13 21:58:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6475ee7b8e1b9a2a74284a44dc6dc2c3 SHA-1: dca616dbb0512278de20eaec5b6de404942b29df SHA-256: 4c8b865e585dbb71525849eddc5daa021475f08b6645f9ddfb708aad01ff4b18
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/strik?utm_term=georgetown+university+area+map PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5fac3ce796146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_5fa78f7e4236e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f9032fd74089.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/97627914917.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/bravely_default_cia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d90bcb-c555-48a3-a841-36db2fed94dd/97403847576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1840da3-d964-4e31-a1bf-ee18a43ac486/74534265368.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/18540039961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c44679-b347-4b1d-aa34-82a639fe0bfd/83321329752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326fc7ab-08f5-4418-b267-f818e5d3bc71/rulinovulavifivujowewe.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/delufadaluzuletemefikiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6e2c7e-f0fb-45c3-a6ab-82038417e663/andras_mocsy_pannonia_y_superior_moe.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/stony_brook_school_branchburg_nj_website.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/24477433254.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f5b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF5B4 16316 bytes
SHA-256: eea60136f9c37ce21e9c5ec021a99d6c99e7e848284bf0119fa9a59eaf66c579
font_00_sfnt_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 5392 bytes
SHA-256: 5c1930eaf58f257d2431e81322fe9906d0aa082ecaf319663c236681e3d8a9b0
font_02_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 10320 bytes
SHA-256: 727bc43fa766b47da9b542e87a279cb2087f5bc1721fa35a2d8400a6a019e996

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