Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aead64177ae6ecb…

MALICIOUS

PDF

80.0 KB Created: 2021-02-07 18:25:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fce2895fe8c44475e91cafb32546a278 SHA-1: f13f3169a8676adbafba97f22340359d60e434bd SHA-256: 4aead64177ae6ecb2446707b2fa3e07ce7ddb1c0b449bf066f4dfe998b742121
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a malicious payload or conduct phishing. The document body, though heavily obfuscated, contains text related to 'simplification of block diagrams' and authoring information, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the presence of an external URI is a strong indicator of malicious activity.

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://druttle.ru/123?utm_term=simplificacion+de+diagramas+de+bloques+online PDF link annotation
    • https://cdn.sqhk.co/rekosiseweno/gghdchf/89119005915.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/eiadGhb/25184159742.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/eskiuig/zadasitabumukugejaba.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/iahfgeM/spirit_airlines_baggage_fees_overweight.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/difhapH/53734649766.pdfIn PDF document text
    • https://cdn.sqhk.co/gediwuwanol/2rpiejc/38560925490.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/jcMXXjg/kefolazome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_601dcfcaf22aa.pdfIn PDF document text
    • https://cdn.sqhk.co/bopesajan/Tr6Jawv/auto_clicker_automatic_tap_true_developers_studio.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/c53Ahf4/fidavuvigoworonovutex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/elementary_language_practice_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/balsamiq_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/98245574180.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/jawamoxabet.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/allahabad_university_entrance_admit_card_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/abyssal_sire_guide_alora.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/bruxelles_formation_uccle_belgique.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/new_dj_song_odia.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/characteristics_of_valuable_information_in_business_research.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 5844 bytes
SHA-256: 097b103924691d9b217fbf0e7fb0e2b07c96c4de1dfd3bd8e8d43350be87ed69
font_01_sfnt_off0000e9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 2092 bytes
SHA-256: 6e5de5c6bcb7fdd8c5ca0d25823a8f80e6c764803c1b732dbc9c425a5c0f8ea5
font_02_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 11480 bytes
SHA-256: 4f2e42b56573fbd798abd4f1f3a1650bbaff5f38a32ef636a7b478e0a33aeefd
font_03_sfnt_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 16512 bytes
SHA-256: b0b64954ded6ca40f409c8aa92f06eecfddf061275ec509028a00cd78d6ccfc5

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