Malicious PDF — malware analysis report

Static analysis result for SHA-256 c353ce9184998d28…

MALICIOUS

PDF

76.1 KB Created: 2021-05-17 00:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0e778b6509eb39225c52b4e0213682c5 SHA-1: 117cdce2c3f25cba3a07a59ee49cb8659c2ca87c SHA-256: c353ce9184998d2862cb5bea3f87cf67d0ceb7510c1416133ce9ffd052e4b5a8
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 0.9997

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://dugedepap.ru/strik?utm_term=skyrim+can+you+keep+stolen+horse PDF link annotation
    • https://cdn.sqhk.co/gobefuvumi/JqZjieS/ding_dong_fnaf_roblox_id.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/jiigxaJ/99244093154.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/Yhiibhh/54497281212.pdfIn PDF document text
    • http://puveduxorapuba.iblogger.org/guideline_value_in_vellore_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/toxodimina/hhblN2s/kho_kho_score_sheet_free.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/6b29e29e-058e-465f-9776-6074551c3de2/42654509244.pdfIn PDF document text
    • https://6974b9b2-fc2a-4e9b-9495-84ff65489eb7.filesusr.com/ugd/395280_7f05db3edaa34ebe9b9eaca049fd17f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8330a20d-e2f1-41d7-8f05-4258bec55861/tracfone_samsung_galaxy_j7_sky_pro_specs.pdfIn PDF document text
    • http://renebizokav.epizy.com/70801950770.pdfIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_2ccf011c5724413aafa44251b80f6c62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5741327a-d5df-4b54-bd2a-676e00847ed8/2687947371.pdfIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_3466ec8cd93d4ea69eaded2e4969901f.pdf?index=trueIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_242d66d2c3f34263b2aff1302bd8ca77.pdf?index=trueIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_75d0bbde2d92403ab14a6317fd710f00.pdf?index=trueIn PDF document text
    • http://jumezasaguruwu.epizy.com/6964778557.pdfIn PDF document text
    • http://pukadevimetuz.rf.gd/transformer_voltage_ratio_meter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab1a58e5-0c08-4dc3-8b0e-4a2de992e3c7/what_are_logical_operators_in_computer_science.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_ebe496d29a0b409fb7f3fadc6ffd4273.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_22ab7243b7be4724b0cf0ab9287b27e6.pdf?index=trueIn PDF document text
    • http://vagamasorowiv.epizy.com/xujaxarasewavenejonegup.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_184adaccce614f86b479b83cb10ec0ce.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_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 5444 bytes
SHA-256: aa804fb37851066c783f7095d2291585426e97e1bce7aea31a2a04bc3a7ac1dc
font_01_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 10704 bytes
SHA-256: 6a59d110e3230d0311457fe31c90301113babc0aa523406cf63403b227a82f4f