Malicious PDF — malware analysis report

Static analysis result for SHA-256 107018c1f2780364…

MALICIOUS

PDF

75.1 KB Created: 2021-04-05 14:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ac99ca825c93c24484c3531d29d3c48b SHA-1: 4ac746a0571ed3b361e92abf3f276843e48d2c2b SHA-256: 107018c1f278036431ada13fc19fb6be5d102d64193680917baca9e0352130d5
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely the primary lure. The document body, though heavily obfuscated, suggests a pretext of a book review to entice users to click the malicious link.

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://lozipotod.ru/strik?utm_term=the+confidence+gap+book+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473044/normal_5fd1fd93bb932.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewakuw/fhj8gcV/facebook_lite_login_online.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/2gijegc/analyst_notebook_demo.pdfIn PDF document text
    • http://masterpowerpoint.com/wubalugujoginokamd42ka.pdfIn PDF document text
    • http://cabinetsop.xyz/479667965226fkgf.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/Lie7jfO/febexojigazepifomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_6026e9df07f26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_6039ae4515a31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dalava/budesonide_formoterol_inhaler.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/17442154743.pdfIn PDF document text
    • http://gupenub.epizy.com/89228957039.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/why_does_my_keurig_keep_dripping_after_brewing.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/tojigasedadixafelivix.pdfIn PDF document text
    • http://jubalagifagusop.epizy.com/pasodawakin.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/awg_cable_table.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/truecaller_pro_app_free.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_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 5512 bytes
SHA-256: ab665f7d61d86d4c9f12efcd1a2ce835fc509ac874cc53b3d706f4bf6eeed237
font_01_sfnt_off0000fb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 10844 bytes
SHA-256: f2bcc3dec94d1754c48e0a2cb93a7e3cc6c992963565f0e7af69cfaec669e4b4

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