Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de5d55a20c729a1…

MALICIOUS

PDF

86.7 KB Created: 2021-03-24 08:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e29b543b0864a6e70559eb7ad43da663 SHA-1: 7b06e1e055db65cfa42712a3e65f0967f7998564 SHA-256: 4de5d55a20c729a1285472a6f8412a13aa387942098bcdfda796db0151066b01
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'application form for job pdf', indicating a social engineering lure. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=application+form+for+job+pdf
    • http://piwofoterif.sportsontheweb.net/banished_poradnik.pdf
    • https://cdn-cms.f-static.net/uploads/4465914/normal_60435dd7d0c8c.pdf
    • http://linodogeb.scienceontheweb.net/why_we_love_the_way_we_do_book.pdf
    • http://xovuwut.iblogger.org/wopojitejene.pdf
    • https://cdn-cms.f-static.net/uploads/4485176/normal_5fe6aee7947b3.pdf
    • http://gakukuketisalum.scienceontheweb.net/what_reading_level_should_a_5th_grader_be_at.pdf
    • https://static.s123-cdn-static.com/uploads/4459624/normal_5fed3cf0430df.pdf
    • https://cdn-cms.f-static.net/uploads/4369141/normal_6035e3f7b0369.pdf
    • https://cdn-cms.f-static.net/uploads/4369504/normal_5fd389ff792f6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_fe2f5059fd354b679acb082429b386e3.pdf?index=true
    • https://s3.amazonaws.com/xalexojaxipud/fibuxipeku.pdf
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_05f95456c046482db6470854f3c19b53.pdf?index=true
    • https://def05634-b969-4265-beeb-1e7d695e9a44.filesusr.com/ugd/6865ce_fde5e19f491a41bf9928dd4a63f5edb4.pdf?index=true
    • http://nixomirorubu.myartsonline.com/how_to_thread_singer_heavy_duty_4411.pdf
    • https://b09d99c6-da67-4e55-b5b3-baceba093817.filesusr.com/ugd/a69c6c_0cb33d2844bc4ed39579bbde1228892f.pdf?index=true
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_dc3cc909b2e3464a907409cc5f2c96f8.pdf?index=true
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_b9f13bf9f89649ae83220cf992c1908c.pdf?index=true
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_3535571c40e446949c3012957368a3b9.pdf?index=true
    • https://f516a5e5-1936-4b34-b436-a929b3a34b8d.filesusr.com/ugd/774001_a7bef11b524b4b7d86681aeaa678d6c9.pdf?index=true
    • https://s3.amazonaws.com/defipedibe/gixexufutelelir.pdf
    • https://s3.amazonaws.com/fukepez/renaissance_periodization_training_template_review.pdf
    • http://suxanovovogemi.rf.gd/craftsman_c3_19.2v_lithium-ion_battery__charger_starter_kit.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010456.bin
81022776fbca7963c2ab40d0cf8c8635dcb31890f5fe2505fcbf587dc71d0f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 5328 bytes
font_01_sfnt_off00011662.bin
d4b43de6bb16f5ce7466e35022305de37660ed2e15aa1383d21ffacf6ad37a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 10876 bytes
font_02_sfnt_off00013bb8.bin
22237451156c68c197ed90e049e9efeb70c522a3c53b3b015afea6a434ab541f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB8 4244 bytes

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