Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f4e11a9c5e3360…

MALICIOUS

PDF

194.1 KB Created: 2021-02-17 12:13:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 28fd1d7b6783b1cf333af68596ad5fdb SHA-1: 21afbdd8d61077c5b8824bbc394830509394afba SHA-256: b4f4e11a9c5e3360cfd0b9470729eb7de85c8d853cb60972fa01a518df74cfc2
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'druttle.ru', which is likely used to host a malicious payload or phishing page. The document body is heavily obfuscated, but the presence of the external URI and the malware detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://druttle.ru/strik?utm_term=agno3+%252B+nh3+%252B+nahm PDF link annotation
    • http://monoga.space/bootstrap_kanban_board_templatebgju0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424689/normal_5ffe15d50b3b5.pdfIn PDF document text
    • http://premial.su/26622582497lr6bv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_6017288d14238.pdfIn PDF document text
    • https://wukarogokemek.weebly.com/uploads/1/3/0/7/130739107/51685f149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_6009d0566672d.pdfIn PDF document text
    • https://kamapapidez.weebly.com/uploads/1/3/5/9/135962567/verasif.pdfIn PDF document text
    • http://ramuwazezu.22web.org/5_day_workout_routine_at_home.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385198/normal_5fe7c9a125a11.pdfIn PDF document text
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/wabaziditufunez.pdfIn PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/kafegovaxisakekumif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/fuziwofakun.pdfIn PDF document text
    • http://didaduxazej.epizy.com/cold_war_events_and_policies_chart_answers.pdfIn PDF document text
    • http://monufojama.rf.gd/35294338297.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/chip_avira_android_kostenlos.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/external_stylesheet_html.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/rufukejusunivotapu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001f1df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F1DF 45280 bytes
SHA-256: 4d6c892e7978a45a88380371088e8758324c0d3f2dc1e5dc292c55428093cb0a
font_01_sfnt_off000279e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x279E8 4944 bytes
SHA-256: 21ce77168e56fcfcb83a656373b8d71c2f0b1a37a1faf946d3046653b6ea6dbc
font_02_sfnt_off00028a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28A9C 3772 bytes
SHA-256: b850e935aaf604f3e1824861b6c46746957ce6d0e1401f4bf16d070b42224529
font_03_sfnt_off00029640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29640 21332 bytes
SHA-256: bc3e6488cac8dc27493b78c8a12645edd1f357d312b098fc13123f384e4c26bc
font_04_sfnt_off0002cb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CB2D 16508 bytes
SHA-256: ad2db31021cece9c5d9f2d8729919362726240b098eba34caa4f329d179d4d2b
font_05_sfnt_off0002e1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E1F7 6700 bytes
SHA-256: a073bca3b90d8814648dcd0e84400f65e36e1d608921d8e24ee044a0125905b9

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