Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40cbf766c006198…

MALICIOUS

PDF

78.1 KB Created: 2021-02-13 17:05:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a9902084949bf0c5c2b3bea1926d2674 SHA-1: d9b6f060d97a7e79e7d34bc2a6ceae25fd1850bc SHA-256: c40cbf766c00619819a84178d8f23f8641c5443a3180ca3f9bf095eec122acac
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, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, suggesting an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to be related to a quiz, aligning with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=wrestling+star+quiz+answers PDF link annotation
    • http://xsafak.com/us_citizenship_test_answersopcmi.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/7865Gq6/alone_lyrics_alan_walker_ft_ava_max.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/cjaDRgi/warframe_defense_without_damage.pdfIn PDF document text
    • https://cdn.sqhk.co/zenokosix/jDArUhh/fitness_circuit_training_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/JhcevUj/royal_caribbean_international_job_vacancy.pdfIn PDF document text
    • https://cdn.sqhk.co/tokexinolelu/z2gd4XG/new_york_traffic_cameras_ticket.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/jahcIie/jasasefezonalibupuvepiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496824/normal_5fd78894a8b09.pdfIn PDF document text
    • http://triple-doska5.club/brindisi_report_guna_beachze14h.pdfIn PDF document text
    • https://cdn.sqhk.co/xijodepub/25uK7KK/tadafetuxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://leximadibiwojid.epizy.com/73235148816.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/coliform_bacteria_origin_of_word.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/54647582552.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/26152000957.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/anand_movie_all_song.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 5136 bytes
SHA-256: a2275ee9fe6f8b33ddcf83db04e977852ba2ed93d45125c54f8710c3a41e02ee
font_01_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 10468 bytes
SHA-256: 26099b6f9cfbacf8bf070b1f4f95f43d1f75a2d0a0936545f3e9eaf38ed0419e
font_02_sfnt_off00011437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11437 16768 bytes
SHA-256: 1b9bc2c2d73efae04997164d7cae788f79ba13a7d084095426078d110bb4762e

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