Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12efdb83ee30408…

MALICIOUS

PDF

82.5 KB Created: 2021-05-09 22:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b52d5c27cff627efe5acea23da77e329 SHA-1: 205cffdf74544148eaf4beb1d22e2ca869bd22d2 SHA-256: f12efdb83ee30408c4721fca7f60a49f7fbf9e83c832a4c20974af2b8b974c05
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, identifying it as a phishing trojan. It contains an embedded URL pointing to 'nipisod.ru', which is likely used to deliver a malicious payload or conduct phishing. The document body, though heavily obfuscated, appears to reference a 'Nikon d40x camera manual', suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=nikon+d40x+camera+manual
    • https://cdn.sqhk.co/moviferu/jeDtygi/lufirebamevigubokupa.pdf
    • http://fapasevusiledap.mygamesonline.org/sawutedu.pdf
    • https://cdn-cms.f-static.net/uploads/4481058/normal_603e8b6bc7320.pdf
    • https://cdn.sqhk.co/duzefodaf/hgBC6hc/girl_frontline_event_guide.pdf
    • https://cdn.sqhk.co/mipijotom/ib1jhx4/19541895363.pdf
    • https://roxasudafuj.weebly.com/uploads/1/3/0/7/130740166/xowud_lofidusewe_mijuburuso.pdf
    • https://cdn.sqhk.co/depivuni/ugea2ji/56669435632.pdf
    • https://vavaxumepanev.weebly.com/uploads/1/3/6/0/136097425/lalavotexaja.pdf
    • http://rijebipimaba.getenjoyment.net/air_conditioner_and_refrigeration.pdf
    • https://static.s123-cdn-static.com/uploads/4461748/normal_5fe55b4961038.pdf
    • http://wowogobofomufu.mygamesonline.org/hyperbilirubinemia_neonatal.pdf
    • https://cdn.sqhk.co/surodamiz/ZcEyjbZ/88785267939.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_c63d5253dd174483b27e40ae939a4d64.pdf?index=true
    • https://aaca6425-83b8-4992-a49d-2ec8a2d61848.filesusr.com/ugd/304e3c_b7eb45b45ef2432197c8a5f2b076408a.pdf?index=true
    • http://ketabigumowun.atwebpages.com/fokij.pdf
    • https://s3.amazonaws.com/vixuwogetiv/zugariv.pdf
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_1e5d931df67146ddb8b4ef449071d1ce.pdf?index=true
    • https://s3.amazonaws.com/datarofapakil/fekisopi.pdf
    • https://s3.amazonaws.com/zexozavo/44818292803.pdf
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_e261f0f448714e2e846dc0ddeafc1b01.pdf?index=true
    • https://s3.amazonaws.com/zafibimutadoti/indian_ich_gcp_guidelines.pdf
    • http://loxupobupibim.atwebpages.com/belling_format_cooker_manual.pdf
    • https://s3.amazonaws.com/kudufigunabi/rirexuruzufoje.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_off0001035c.bin
efd05c9cdf0eaf0ce35719d9ce49915d01031f4ea531deca050a2b9db38a7aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 5240 bytes
font_01_sfnt_off00011525.bin
5d79bc3716592db4e73ca0e40de3e2173ee43f7e22adf9876a3a470cf84d5468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11525 11632 bytes

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