Malicious PDF — malware analysis report

Static analysis result for SHA-256 311dba08b7affd76…

MALICIOUS

PDF

71.3 KB Created: 2021-04-05 02:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d440c4bf41eca540e86beec495765737 SHA-1: d487fe35681d5346ea7d3c8d96c58f001faa7cac SHA-256: 311dba08b7affd76afb44491fd39fa69dfa71e13e0ccfe05089515e84c9bc7b0
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing attempt. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=have+an+ice+day+geometry+worksheet+answer+key
    • https://cdn.sqhk.co/nisugavu/cgciagg/rejujiwafifagamura.pdf
    • http://jixoxegige.iblogger.org/i_belong_to_you_hillsong_chords.pdf
    • https://cdn.sqhk.co/dofexoxev/s7jhiPY/fun_2_player_games_play_store.pdf
    • https://cdn.sqhk.co/benibavagoge/iifibhi/36646350313.pdf
    • https://cdn.sqhk.co/reriwoduriju/bBUjgje/lalezataduwefeso.pdf
    • http://pixunune.sportsontheweb.net/principles_of_psychology_breedlove.pdf
    • https://cdn.sqhk.co/vekotevudoze/bdlrJ1R/takeout_central_asheville_coupon_code.pdf
    • http://xugilerasifoveg.22web.org/rorenalejabidalerazo.pdf
    • http://galosidijixiwu.mypressonline.com/9477917488.pdf
    • http://garowige.iblogger.org/kokikupulanikuzo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gefafeduvul.epizy.com/my_ge_profile_refrigerator_stopped_cooling.pdf
    • https://uploads.strikinglycdn.com/files/4d038b33-f7ae-4933-b162-8ef94f02dd6b/motanobebulojase.pdf
    • https://uploads.strikinglycdn.com/files/8e6b0c8b-71bf-4d20-ac29-e1e7ea32ff16/what_is_the_learning_theory_in_psychology.pdf
    • http://lobakixadob.epizy.com/51020346433.pdf
    • http://ketekuvewekuga.rf.gd/easy_way_to_balancing_chemical_equations.pdf
    • https://uploads.strikinglycdn.com/files/7082d30e-7366-401d-88a1-fa5186d52e79/bissell_proheat_pet_operating_instructions.pdf
    • https://uploads.strikinglycdn.com/files/343535c8-5c6c-4274-94a7-fe20b20be095/insignia_24_inch_roku_tv_manual.pdf
    • https://uploads.strikinglycdn.com/files/69aefaa3-bf1c-4200-9eb4-adb501c393ed/xupavusu.pdf
    • http://menepanago.rf.gd/susanopudejotorexuxijimu.pdf
    • https://uploads.strikinglycdn.com/files/c545f622-2d06-4660-a26d-72a8a699e089/windows_10_pro_free_download_full_version_2019_64_bit.pdf
    • http://budibisila.epizy.com/brunner_and_suddarth_12th_edition_volume_2.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_off0000d040.bin
a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD040 2900 bytes
font_01_sfnt_off0000da82.bin
492e735e1848b081144ed6161178df733253ee45381ce8e1367b43414f44d13a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 5600 bytes
font_02_sfnt_off0000ed81.bin
86b04d5283370a35c99728a253d36d921481a27034b373aa87eabf4f101cbfae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 9872 bytes

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