Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f2a576d6ac1f1f…

MALICIOUS

PDF

96.7 KB Created: 2021-04-20 18:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fb955d9b6caedcdc525c06c2b35ee970 SHA-1: b33df6cec555818060599f5b94ef5ce016d27960 SHA-256: a4f2a576d6ac1f1f6da516f6fac45dfc1a9f01eeb647810a37900d316bbeea39
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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/strik?utm_term=induce+labor+sims+4+not+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488135/normal_60593c0232ea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_6025f50716272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_600d289fec3d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_6048904f26dd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_5fd33b8c8204c.pdfIn PDF document text
    • http://tinesoxexi.22web.org/dapokijut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490380/normal_6067a01d51623.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469351/normal_600926cea673d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427795/normal_6012f8ecd997b.pdfIn PDF document text
    • http://rodegadafag.iblogger.org/missguided_promo_code_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369923/normal_5fe2264925aed.pdfIn PDF document text
    • http://vemafenuxaj.22web.org/el_ser_uno_vi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/582b0677-d872-408a-80c6-4fed809d09cd/wuwoxabojov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f62a73-f2c7-4f19-8bd5-49b96c74f657/dark_souls_2_release_date.pdfIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_e30944cb12b7425fba1e6904bc08b06b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f0cf8c9-e75b-47b9-8b3b-03efc20ab674/minecraft_handbooks_new.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/848ed39a-33ca-49c3-869f-56d16a5d89ce/robot_vacuum_cleaner_india_reviews.pdfIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_c0ba6ca71c7e49aeb46d686dbe95c346.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55cc72c3-3c8a-4029-836d-f705bd03c68a/97427656694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f691ae71-e648-4934-a637-d84086cecb9b/53938272350.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_8b10e2fca3b04047a8af442c9a6662bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c60392-2736-45f7-bb10-e42c227ba864/lutagakunitolu.pdfIn PDF document text
    • http://kaxoxosav.rf.gd/zivosivivapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c78b77-e90e-406b-b21b-96b8e91e6aab/29561041748.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_82e06ce7c78d402ca5942c0d3b70048c.pdf?index=trueIn 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_off00013980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13980 5580 bytes
SHA-256: 66aa8dc6c947d16ad95dbe4924ed5a702bed0da711a4fa13c1b9e2a9edc98d0a
font_01_sfnt_off00014c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7F 11392 bytes
SHA-256: 6007bd356738ffcd7e8c98e517009ced181f3a9275da409dbf357411fbf7e403