Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f3822072cb3139…

MALICIOUS

PDF

87.6 KB Created: 2021-03-22 00:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb8273e39c91752744713466d8bbb4be SHA-1: 26ceeac80392bb40b21a6d3aed3c7db65767e7b5 SHA-256: 13f3822072cb31397c4b177ab0609198ae911352c47a1b81e2fc60d93d5ad67d
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. Heuristics indicate the presence of external URIs and a high likelihood of malicious content, further confirmed by ClamAV detection as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=blue+planet+coral+seas+video+worksheet+answers
    • http://lotupojaxuvutix.mygamesonline.org/jidik.pdf
    • https://cdn-cms.f-static.net/uploads/4470380/normal_6034610cf0cc9.pdf
    • http://pavareginuko.22web.org/crosley_everett_record_player_stand_in_mahogany_finish.pdf
    • https://cdn-cms.f-static.net/uploads/4495413/normal_601921736ca31.pdf
    • http://fakurivevid.scienceontheweb.net/63680714941.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/mikibetiv/1869953301.pdf
    • https://uploads.strikinglycdn.com/files/dabd149d-0308-4aae-8716-a9fbb65d8c3f/kidepa.pdf
    • https://s3.amazonaws.com/kumasala/alveolektomi_jurnal.pdf
    • http://jujageritoxo.atwebpages.com/book_report_outline.pdf
    • https://s3.amazonaws.com/gawabog/simple_future_tense_will_worksheets.pdf
    • http://revifobatuge.rf.gd/zirarokujem.pdf
    • https://uploads.strikinglycdn.com/files/08cfd0d4-f54a-4c74-9e19-6cfa8b1e1b86/vox_premium_features.pdf
    • http://fajubumejuxuful.rf.gd/37478372819.pdf
    • https://uploads.strikinglycdn.com/files/3a4fcb35-4610-466e-8fb1-f95d2df77f70/xojizosi.pdf
    • https://s3.amazonaws.com/gurafoga/36872635679.pdf
    • https://uploads.strikinglycdn.com/files/5b5c295c-f271-4fd5-922a-6c402d2ecf75/fatshark_dominator_v2.pdf
    • https://uploads.strikinglycdn.com/files/c8a4dc0d-8af8-4a05-bc75-5dc75816edde/ralepejunosogebin.pdf
    • http://kadinox.epizy.com/bridge_over_troubled_water_song_free.pdf
    • http://jajojamoxarug.epizy.com/gloomhaven_brute_tank_guide.pdf
    • https://uploads.strikinglycdn.com/files/a773349f-3a0d-4857-b904-d5853247b701/why_is_my_electric_pressure_washer_not_working.pdf
    • https://s3.amazonaws.com/dopugaxelelema/module_3_permit_test_answers.pdf
    • https://uploads.strikinglycdn.com/files/c855fa82-743d-406f-a132-af8e37927de6/bsc_civil_engineering_books_name_list.pdf
    • https://uploads.strikinglycdn.com/files/c08d8da7-221a-47f8-8371-316ca5df1cf2/how_to_do_vector_addition.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f7.bin
1d4335aa540d4cfb6eafbacd50e01b86f1f17d4662bcaf45a7f6e253a62f6534		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 5308 bytes
font_01_sfnt_off00010605.bin
ec7d3ab074b7aeeae75c18f3efdce5c0800df9898d80f394efb01bc311685c02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 11532 bytes
font_02_sfnt_off00012d7b.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7B 16092 bytes
font_03_sfnt_off00014242.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14242 4324 bytes

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