Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa24e2e3f16667ae…

MALICIOUS

PDF

95.5 KB Created: 2021-03-29 06:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58d7dee4dbb853d9c7d342c9569ac32c SHA-1: 2461b8a9fecbb3618c3421bf57561037cc1d7bde SHA-256: fa24e2e3f16667ae9952fe99638a7ca5e7a9fa121c5e2439e50809d4df9588ee
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, identified by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'a tale of two cities indonesia pdf', likely intended to trick users into clicking the malicious link for a fake award or document.

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://midufefew.ru/award?keyword=a+tale+of+two+cities+indonesia+pdf
    • https://cdn-cms.f-static.net/uploads/4420597/normal_604ce42b8050a.pdf
    • https://static.s123-cdn-static.com/uploads/4392857/normal_5ff0ba628360d.pdf
    • https://cdn-cms.f-static.net/uploads/4388835/normal_6037cde334c33.pdf
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5ff4b2b47077d.pdf
    • https://static.s123-cdn-static.com/uploads/4481055/normal_5fe3b9a39f539.pdf
    • https://cdn-cms.f-static.net/uploads/4501656/normal_6049f7b5a5e5f.pdf
    • https://cdn-cms.f-static.net/uploads/4482853/normal_605213232eb45.pdf
    • https://cdn-cms.f-static.net/uploads/4376602/normal_5fe7661b16eb9.pdf
    • https://static.s123-cdn-static.com/uploads/4366043/normal_5fd04fe3b782f.pdf
    • https://static.s123-cdn-static.com/uploads/4447433/normal_5ffaa1aac9026.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9ba1a2b0-8b88-41e0-a3f1-895902f71e06/96746000890.pdf
    • http://bexilonedatisud.epizy.com/english_analogies_mcqs.pdf
    • https://uploads.strikinglycdn.com/files/833486eb-981d-4c88-8ea9-e2cd0f797619/jaxon.pdf
    • https://uploads.strikinglycdn.com/files/e0f9191c-31af-44e8-b74b-e55792ea4c0a/38480123762.pdf
    • https://uploads.strikinglycdn.com/files/696ba592-4b0c-446c-953b-cd2a83f4d851/how_to_replace_battery_in_a_firex_smoke_alarm.pdf
    • https://uploads.strikinglycdn.com/files/f36c5e4b-80e0-472d-9227-2ec9aa4b01d3/harry_potter_1st_movie.pdf
    • https://uploads.strikinglycdn.com/files/df827315-6d6f-4fa3-8163-b5db170d984d/what_was_the_purpose_of_punishment_in_medieval_society.pdf
    • http://xogonat.epizy.com/primary_hyperaldosteronism_diagnosis_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/35ca1de9-ee9c-40ab-9f37-4885db30b317/how_much_does_it_cost_to_repair_power_windows_in_a_honda_civic.pdf
    • https://uploads.strikinglycdn.com/files/f2801794-398b-4d31-ab14-131aaa4a274f/kenmore_70_series_dryer_timer.pdf
    • https://uploads.strikinglycdn.com/files/7a90eac4-5328-4735-aeb6-d25113bcb2a0/raduwokerukej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012471.bin
3e7ca5e9d8e9d40d5f6ab31939b2ca596459cdb4ebae6e4041a64a2d6a69fcfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12471 5136 bytes
font_01_sfnt_off0001361a.bin
0e060b7e3c8265d72d71bc36064404c52abf99c9a4821ddb85f0e39a3c983280
pdf-font-stream PDF embedded font (sfnt) at offset 0x1361A 11160 bytes
font_02_sfnt_off00015bec.bin
d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BEC 16060 bytes