Malicious PDF — malware analysis report

Static analysis result for SHA-256 a350db8cc097400d…

MALICIOUS

PDF

82.4 KB Created: 2021-03-29 00:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9b913e3a58e1f384fbf8d813d3329ae SHA-1: 81b089294ba85976442fc872c963f644ab44f441 SHA-256: a350db8cc097400df6922c7acd3ac51f709415180ded3b2f210300463f4c66a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://kuzutuzo.ru/award?keyword=iphigenia+in+tauris+goethe+pdf
    • https://gasuzenop.weebly.com/uploads/1/3/4/2/134266144/biveguzexexi_vamexuvizituzov_desoxixa.pdf
    • https://bujubisagakib.weebly.com/uploads/1/3/4/3/134323903/3575634.pdf
    • http://pasendapp.online/radivedupidetuxozagowibanshlg.pdf
    • https://fikijumosoliz.weebly.com/uploads/1/3/5/4/135400707/gamisaweremanu.pdf
    • https://muwozijazi.weebly.com/uploads/1/3/4/7/134736858/xifovesu.pdf
    • https://xidalivukudupet.weebly.com/uploads/1/3/4/3/134319957/6b3cde8083.pdf
    • http://magnifioco.site/global_initiative_for_asthma_gina_guidelines_20181bwt0.pdf
    • https://wukarogokemek.weebly.com/uploads/1/3/0/7/130739107/1935088.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8444262d-9c75-4e38-929a-ec173f0ff4dc/68836816798.pdf
    • https://uploads.strikinglycdn.com/files/70afd45c-714d-4e16-8ad8-401253205e44/zagedelemofuvopeju.pdf
    • https://s3.amazonaws.com/zijivevip/agree_and_disagree_statements.pdf
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_93430bf4e6e34bad86fe8c67f43d674c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/376b2949-a552-4f66-864d-2f67119f3407/crank_ellen_hopkins_book_free_download.pdf
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_d4380096638a4e8881c72a24a2ba6864.pdf?index=true
    • https://s3.amazonaws.com/mexijegedakol/97732588844.pdf
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_a2a52b2921534f6ab525d0f11f312814.pdf?index=true
    • https://s3.amazonaws.com/fajonubinomeder/bonavita_5_cup_manual.pdf
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_559ea62e2eb740e4a949081b02431e2b.pdf?index=true
    • https://s3.amazonaws.com/xeruxaxer/23404601292.pdf
    • https://s3.amazonaws.com/gekixadonuru/fosixobagaferaf.pdf
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_96a87e5e7cda43429050f833c5392623.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe8c.bin
09ff93bc4d69e36baf029f3e348eca155b9a39c4a330d39193648d5eb59a7b09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 5208 bytes
font_01_sfnt_off00011040.bin
e66a6907c62182fff111b1a680ff0c53e9feddb4cd1b681dd0531d489f2bf9e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 14028 bytes

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