Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1671490ade2a73c…

MALICIOUS

PDF

91.9 KB Created: 2021-03-15 05:10:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e6b6d0618f63cd55f8bf9a67811ed77 SHA-1: 7306455aedd74d052ef9bb3a821372d48ff5ac4e SHA-256: c1671490ade2a73c2e7cd9b8eb5fbdaf865d6a809f5c453c8d09bf3ad0b18ef5
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL, https://xezojetit.ru/wix?keyword=astro+yoon+san-ha, which is likely used to redirect the user to a malicious site. No scripts were extracted, but the presence of the URL and the high risk score strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/wix?keyword=astro+yoon+san-ha
    • https://cdn-cms.f-static.net/uploads/4369173/normal_6012286389029.pdf
    • https://cdn-cms.f-static.net/uploads/4420459/normal_5fd7ecc9ae1b2.pdf
    • https://static.s123-cdn-static.com/uploads/4480756/normal_5fcecfa56a947.pdf
    • https://static.s123-cdn-static.com/uploads/4459324/normal_5ff38b102bc8c.pdf
    • https://cdn-cms.f-static.net/uploads/4367632/normal_6017917c05749.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kisagoz/78008353343.pdf
    • https://s3.amazonaws.com/zuvovoxigumuz/pisalusigeba.pdf
    • https://s3.amazonaws.com/girilifawuxi/working_with_the_law.pdf
    • https://uploads.strikinglycdn.com/files/8ccc4c86-53f4-41f9-8729-3977cb055660/does_dunkin_donuts_delivery_near_me.pdf
    • https://uploads.strikinglycdn.com/files/40bc5b82-9308-4dc5-90b9-f937bc61e948/what_is_said_to_be_mightier_than_the_sword.pdf
    • https://uploads.strikinglycdn.com/files/2927ff71-2944-481d-a426-ea5ed1c1fb3e/verunadurolud.pdf
    • https://uploads.strikinglycdn.com/files/6fe13192-d12d-442f-b0ca-19e9f9c03afc/how_to_use_amazon_echo_dot_4th_generation.pdf
    • https://uploads.strikinglycdn.com/files/c9d0ddea-cab9-4bf6-8093-285113619b5a/what_does_an_early_dinner_mean_in_england.pdf
    • https://s3.amazonaws.com/rurovikejigibu/nox_android_emulator_apk.pdf
    • https://uploads.strikinglycdn.com/files/cfd1d847-cac7-4e39-88d5-8aa206cc2871/sikuxipofugaj.pdf
    • https://s3.amazonaws.com/dukajevo/kepatugisemetofuwefub.pdf
    • https://s3.amazonaws.com/wenobagupexekap/xibuzigokuzefa.pdf
    • https://s3.amazonaws.com/tesasubawalozan/acting_lessons_save_file_android.pdf
    • https://uploads.strikinglycdn.com/files/232c5252-f87d-48df-bb16-fa18a05a3c0d/31212568125.pdf
    • https://s3.amazonaws.com/didowugorokirug/whirlpool_cabrio_platinum_dryer_manual.pdf
    • https://uploads.strikinglycdn.com/files/93808b2c-bddd-4bf4-92e9-a479cfd7af7c/classical_guitar_shed_bach.pdf
    • https://uploads.strikinglycdn.com/files/1b56ff04-c1bc-44ce-a501-6aa10503dfa2/virginia_woolf_on_being_ill_summary.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeda.bin
c5f402a6cb5c1c10eb0f74f9bb9c32db323aa067f1867a2237926e671c4c249b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 15776 bytes
font_01_sfnt_off00011fde.bin
e667b39afcddd4fd31e4fd8cdaea359f223d384cab4cb110357e3ce68390678d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 4864 bytes
font_02_sfnt_off00013069.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13069 1800 bytes
font_03_sfnt_off000138f7.bin
00b2b58ec7fd4baf310734a97feb45f8b3bdc6d8654cfc14dbae0db869cf5e0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138F7 11892 bytes

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