Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f57cd929bd5bc4b…

MALICIOUS

PDF

77.5 KB Created: 2021-03-08 08:14:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eb7765587174a490bf4c1f1d07bf66c9 SHA-1: 92fd01643260af05099ed27921b2e1f75644f7e7 SHA-256: 7f57cd929bd5bc4b89fd7d429d5796e47cd02b51aa5e17958a5d79ebdef709c0
186 Risk Score

Malware Insights

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

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 0.9995

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/123?utm_term=international+marketing+plan+example+pdf PDF link annotation
    • https://gitemeloduj.weebly.com/uploads/1/3/1/4/131406811/bedali.pdfIn PDF document text
    • https://kerozuvesiduzam.weebly.com/uploads/1/3/4/3/134375161/zagelovogepami.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410416/normal_5fff3e7c55e87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499633/normal_6023c72a69cd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375696/normal_60434ddb94372.pdfIn PDF document text
    • https://lajogaful.weebly.com/uploads/1/3/4/4/134481829/3317c4358b19.pdfIn PDF document text
    • https://dalupapixoriwu.weebly.com/uploads/1/3/1/4/131438121/wubowir.pdfIn PDF document text
    • https://tamunalu.weebly.com/uploads/1/3/3/9/133999965/kowemeneletera.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_d4f3d88d97e3413e9901081e814ea8b0.pdf?index=trueIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_46b80dc122de4063983193f84999ec78.pdf?index=trueIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_2d4d4012c7d342f9a4681d5854c8a072.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_6a5b65b4259a49f6a48ce0e18bc1b438.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_3bc7b99a57244f0fa820a214217aed03.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_e31b8d2551814b2a92278438bad9e865.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a3e534-b36e-4c4a-9ef8-e1e0c17b4e1f/can_i_cook_chicken_thighs_on_a_george_foreman_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f118e0ca-aa1f-4072-95ad-de9603ec53cb/naruto_databook_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4866b5-2302-48f0-98e3-58f8d5afea79/jabunopexidipapur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc1ac0f-0148-4bd1-811d-242825d303d1/pefifag.pdfIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_851b6f01041c470d92fcd4273898e2dc.pdf?index=trueIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_ae795ba2183c4ffa9d84e6fdfdce7029.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_1cb2f58b7a654a0dafeb8ae0d4baa592.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3f4da0-f300-42b5-a6aa-6238f3ee7f37/zepanavofani.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 5252 bytes
SHA-256: 50f337a668f0adada6112d0eb8044c99cfba0b7afefb097300ab4a03ddd71e5f
font_01_sfnt_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 10212 bytes
SHA-256: 86fbc62009425c09e8c66d0c307f7dfbefb907c8ab30a669efb3f747126169a0