Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a5980439f4eaad…

MALICIOUS

PDF

75.7 KB Created: 2021-06-14 18:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceb4519a37960b17b7e3684a093eb152 SHA-1: c38e7f3f6bf19ae45f41b1bb9683484a563702c5 SHA-256: d2a5980439f4eaad89a35799e13ebbaa145185eb967a13c239ceaa0f2c727c57
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'infrive.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to 'Cathedral raymond carver pdf'. No scripts were extracted, but the PDF structure itself facilitated the malicious URL delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/pbw?utm_term=cathedral+raymond+carver+pdf
    • https://cdn-cms.f-static.net/uploads/4449397/normal_60c47425abf3e.pdf
    • https://static.s123-cdn-static.com/uploads/4490950/normal_60008fe78739a.pdf
    • https://cdn-cms.f-static.net/uploads/4487647/normal_60ba8eca6a997.pdf
    • https://cdn-cms.f-static.net/uploads/4420030/normal_6027652a4f8dd.pdf
    • https://cdn-cms.f-static.net/uploads/4370302/normal_6052605fe3c94.pdf
    • https://cdn-cms.f-static.net/uploads/4458829/normal_60149f0d842f7.pdf
    • https://cdn-cms.f-static.net/uploads/4446491/normal_5fd8e7145e1b8.pdf
    • https://cdn-cms.f-static.net/uploads/4415767/normal_60688186be874.pdf
    • https://static.s123-cdn-static.com/uploads/4393204/normal_60094201ca718.pdf
    • https://cdn-cms.f-static.net/uploads/4458628/normal_60465a56275b2.pdf
    • https://cdn-cms.f-static.net/uploads/4489411/normal_60c152f5b0c23.pdf
    • https://cdn-cms.f-static.net/uploads/4502920/normal_606245f1207da.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d1dfd51f-82ca-4b11-822b-47e24238e8ce/xiwoga.pdf
    • https://uploads.strikinglycdn.com/files/5b4d881f-ed38-4431-8511-a134d7274d3b/37235749461.pdf
    • https://uploads.strikinglycdn.com/files/22c28536-dfb4-49e9-9c62-19db3960467c/77238228515.pdf
    • https://uploads.strikinglycdn.com/files/95dfd7e3-2f23-4cc1-8cb4-6a7526cbfeb9/how_to_change_taylor_scale_from_kg_to_lbs.pdf
    • https://uploads.strikinglycdn.com/files/071e7296-0d5e-4de5-9d46-88518b76a1c6/39900975973.pdf
    • https://uploads.strikinglycdn.com/files/96f82df5-7639-4405-9bcc-e94b3b52e217/gedogew.pdf
    • https://uploads.strikinglycdn.com/files/e973e8de-e50e-427e-bb25-bb088e662c79/93137635671.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcd9.bin
e99911030ebe5d99d53b9ab6799c66587a0b08ee486f01930285738b52a9698d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 5144 bytes
font_01_sfnt_off0000ee45.bin
4720c05edeab01fcb2367c33c7712a023a1750e175ab6b16f42056d1ae89cb03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 10588 bytes
font_02_sfnt_off0001124d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1124D 4324 bytes

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