Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee65d38f6766821…

MALICIOUS

PDF

78.5 KB Created: 2021-03-17 23:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d6ba3944d42bdac6cc7444761da7cd72 SHA-1: 3bd093ef0a20561815c51be2c76281356f5aceea SHA-256: dee65d38f6766821bab07154e4231d69286f53360d36ae6a218f6d15204032ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/strik?utm_term=what+kind+of+juice+can+you+use+for+mimosas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410222/normal_602821662efac.pdfIn PDF document text
    • http://kelnoteres.xyz/sennheiser_xs_wireless_2_staticvc56g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445325/normal_6008b1b65da38.pdfIn PDF document text
    • http://uber-global.com/eclipse_java_swing_designerz4596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_603f223493531.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471273/normal_5ffbad87e986b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486523/normal_5fd68028f3ef0.pdfIn PDF document text
    • http://cheapkeys.site/wonolewiliganevs8z6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488090/normal_5fcceb53b8223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459320/normal_603b9ba6597ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392656/normal_5ffc1b5d5d66e.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/jazofi/analytics_edge_edx.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_eb45f11b9be547a1b0d55729f96d8163.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/what_is_the_main_purpose_of_oxygen.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/zofamadogavedujorezaxoxe.pdfIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_f5fd413d59c84777a861e7d8eaec5e0d.pdf?index=trueIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_93a05f2ad08844b28cab3e497ed6dfb6.pdf?index=trueIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_30fe2c0c1bba446dae33a225949897fb.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_fbcde2e644d8494c815b3ac505b44d18.pdf?index=trueIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_cc004d7bc3a2474ab1ca288d6c476a63.pdf?index=trueIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_3ffaa35cc2c047ef968c83cc6584eccf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/bokipesaneziribeluzi.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_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 5484 bytes
SHA-256: cb1ae7f20b02174e9c0ae5eb7af7b3fdc05e75cec1aa9ca94e87e07124383c4d
font_01_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 10780 bytes
SHA-256: 122bce07e5a6b15220416a63f9eca086cacc33189fa21b4584b11f49e7eee62c
font_02_sfnt_off0001174b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174B 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2