Malicious PDF — malware analysis report

Static analysis result for SHA-256 23923b6e4b3e67c7…

MALICIOUS

PDF

124.2 KB Created: 2021-03-23 02:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7801f064efda7a70044460499cdb2d3d SHA-1: 7fda316c65d9ff93d834abee40417871900129ab SHA-256: 23923b6e4b3e67c744fc6af8728f366051c39a93a3ab546d3c4439cdd97c9db5
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are disguised as academic or software download links, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall detection by security tools point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/wix?keyword=down+to+earth+sociology+introductory+readings+pdf
    • https://cdn.sqhk.co/bozadukopufu/dFheZVR/stellio_music_player_pro_apk_free_download.pdf
    • http://microbladingeyebrowsdallastx.com/briggs_and_stratton_carburetor_repair_video3bg29.pdf
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/01b707.pdf
    • http://meetdouche.xyz/how_to_connect_ihome_bluetooth_mouse8mryb.pdf
    • http://albl.ru/ponatapewalone0x5ri.pdf
    • https://cdn-cms.f-static.net/uploads/4484605/normal_60299d0796dd9.pdf
    • https://logekififej.weebly.com/uploads/1/3/4/5/134502341/zenubesorezobogeko.pdf
    • https://cdn.sqhk.co/wezokobuli/jfMIgdh/tojaduvodimalitupuresu.pdf
    • https://cdn-cms.f-static.net/uploads/4448103/normal_60507eb68831c.pdf
    • http://vulgargirls.fun/xepujider7nh4s.pdf
    • https://cdn-cms.f-static.net/uploads/4443602/normal_6043ff14bc989.pdf
    • https://static.s123-cdn-static.com/uploads/4457008/normal_5fce0727b03be.pdf
    • https://static.s123-cdn-static.com/uploads/4370989/normal_5fd08876a7bd6.pdf
    • https://cdn-cms.f-static.net/uploads/4414156/normal_6010d88188ade.pdf
    • https://gisodotok.weebly.com/uploads/1/3/5/9/135971357/9251570.pdf
    • https://cdn.sqhk.co/burexewejam/iiNsUhj/good_pick_me_up_songs.pdf
    • http://meetly.space/jojowetagogoreledazebuzervc5f.pdf
    • https://cdn-cms.f-static.net/uploads/4404293/normal_5fd8618b93a3e.pdf
    • https://cdn-cms.f-static.net/uploads/4454425/normal_601e6e7302fc5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2fab5423-158f-47d4-b9dd-786886346aca/3000_calorie_meal_plan_to_lose_weight.pdf
    • https://uploads.strikinglycdn.com/files/16e83dfc-fce0-41d8-b076-91fb0358bdee/71705963437.pdf
    • https://uploads.strikinglycdn.com/files/6b785cab-acfb-4645-83cf-e1b2cc8311f0/do_you_need_training_to_be_a_vet_tech.pdf
    • https://uploads.strikinglycdn.com/files/f9bc36fe-eb14-4f5f-b92b-e6c75a7add3c/how_to_be_a_bawse_price.pdf
    • https://uploads.strikinglycdn.com/files/72238ff3-0e88-441c-ae9e-ca9e86d16f8a/fufulasom.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_off0001ab35.bin
dac2b490aa987de830ef66b5669eb69e29d7095e3b92684697cf441fb03165e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB35 5612 bytes
font_01_sfnt_off0001be6a.bin
a9a42692959cfac8b20db91510b37e0cb5674e224b1be5276f147752e0675be8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE6A 10744 bytes

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