Malicious PDF — malware analysis report

Static analysis result for SHA-256 227c61bfa79538f8…

MALICIOUS

PDF

93.9 KB Created: 2021-03-25 03:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64c9fa65f67cb0bf29772a8224f9100c SHA-1: b0843a67b793cbb7da730eb971073a3a8529642f SHA-256: 227c61bfa79538f8dbe1f2048ea5cddf100186e6df5486b889c65d891471b0e2
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 URI pointing to 'bologen.ru' which is likely part of a phishing or malware distribution chain. The document body, though heavily obfuscated, suggests a lure related to educational materials, specifically a 'Siyavula physical sciences textbook grade 10'. The presence of multiple external URLs further supports the malicious intent of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bologen.ru/wix?keyword=siyavula+physical+sciences+textbook+grade+10
    • http://goodsun.fun/21845332813frljt.pdf
    • http://virivuluk.getenjoyment.net/sanomub.pdf
    • https://cdn.sqhk.co/mepetiruzi/2Pgdlia/transformers_animated_bumblebee_fanfiction.pdf
    • http://dapovevi.mywebcommunity.org/15049151086.pdf
    • https://cdn.sqhk.co/xunijejozi/hbP8sib/nisagawaxazikukolejamu.pdf
    • https://cdn.sqhk.co/bovutolomevo/qeI3Yhc/spiral_fracture_abuse.pdf
    • https://cdn.sqhk.co/wafexumu/LihAhbE/vodugodumufojar.pdf
    • http://tuduvodakep.mypressonline.com/tamil_news_paper_download_app.pdf
    • http://wubegewefek.iblogger.org/professional_google_slides_templates_free.pdf
    • http://bikejesoxatelo.mygamesonline.org/the_rational_male_barnes_and_noble.pdf
    • http://tixshopclub.fun/pabawumoglnw9.pdf
    • https://cdn.sqhk.co/vobevufubito/vQhgggF/59082347676.pdf
    • http://persequenteamsohbet.com/scratch_maze_game_tutorialajgzs.pdf
    • https://cdn.sqhk.co/bujugasefoli/himshey/munopexekojujulep.pdf
    • http://revershjtb.site/bevurac7lfy.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tiduro/roblox_asset_er_bookmark.pdf
    • http://poxalurerozelak.epizy.com/radical_candor_espaol.pdf
    • https://s3.amazonaws.com/piradi/mibutebopa.pdf
    • http://giwofigu.epizy.com/huskee_snow_blower_24_inch.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f720.bin
63d04fadcf05537f15bcc7a49a2a2ca7764978d07f0c9c2b62558ceceea1332d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 1584 bytes
font_01_sfnt_off0000fef7.bin
cc372c59fcf3e023e353afa1d8b418895fccb38bc8e8f2c7c082646d556c019f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 3728 bytes
font_02_sfnt_off00010c37.bin
0b7e50c7102c40e62a9bf7b3ce649d950f87b8210d238f2a48c7930a2fe0bacd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 6068 bytes
font_03_sfnt_off000120e2.bin
473209c2b39a0da7cc040acc82c098f7cda2ef543bdb6ad5b49566ded6f77906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 15216 bytes
font_04_sfnt_off000151e5.bin
927094c099d0e4dc36eceaccd08a1ac95f738148933c8835ca040844b0c1c669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151E5 16516 bytes

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