Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c2ff31d6e411d4…

MALICIOUS

PDF

77.6 KB Created: 2021-04-14 04:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d75bbe1ca5b88c03d39cdf4061dc89fa SHA-1: 3ee5cbae62626f2ee0d2aa1e91fa9c74af35d5fc SHA-256: d4c2ff31d6e411d4322aebce21adbb33ca1996ffd3a91483acc5e024add11a0a
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 0.9996

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://gimoguvi.ru/strik?utm_term=how+long+will+i+have+to+workout+to+see+results PDF link annotation
    • https://cdn.sqhk.co/repudodo/jjbnkic/nixapenix.pdfIn PDF document text
    • http://itclick.pro/48736660162efl90.pdfIn PDF document text
    • https://muvanuxeb.weebly.com/uploads/1/3/4/0/134096654/dajan-pelolug.pdfIn PDF document text
    • https://zixaxufomomofir.weebly.com/uploads/1/3/0/7/130738537/pepipokaxunulifixid.pdfIn PDF document text
    • http://creditpm.com/what_does_arabic_pc_mean854m6.pdfIn PDF document text
    • https://pudomawiwo.weebly.com/uploads/1/3/5/9/135958378/bc1ec68e.pdfIn PDF document text
    • https://pugulewex.weebly.com/uploads/1/3/1/4/131406013/9958887.pdfIn PDF document text
    • http://natur-bio.space/direct_indirect_speech_worksheet_for_class_50wh4n.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/iaigdjc/60838366575.pdfIn PDF document text
    • https://xuxukogizi.weebly.com/uploads/1/3/5/3/135320654/davixogo.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/jiiijgd/54933429360.pdfIn PDF document text
    • https://gekofixesijivex.weebly.com/uploads/1/3/5/9/135961820/40604c0.pdfIn PDF document text
    • http://sosebazud.22web.org/lisuzixesemu.pdfIn PDF document text
    • http://jovalevuwalu.22web.org/how_to_use_call_block_feature_on_panasonic_phone.pdfIn PDF document text
    • http://winnerslm.space/belize_gay_travel_guidexftqh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vufagozujidivu.epizy.com/51439696269.pdfIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_16e3bcc9519442d7b39188095fae48c0.pdf?index=trueIn PDF document text
    • http://vizebafep.epizy.com/administration_process.pdfIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_f2e0ea1b37ad4332bc3ef2243332d6e0.pdf?index=trueIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_1ebe78aba1ed421f81deba722132b2e8.pdf?index=trueIn PDF document text
    • https://fae5df41-d68b-4d62-9961-cd33801cec7e.filesusr.com/ugd/f52c73_dd3a4fb00f57443bab9bbb3c9c89bd2e.pdf?index=trueIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_8a4613f0f498400ebcdf65e844a07b40.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_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 5124 bytes
SHA-256: 4a4e6d9f74a62f03f2854fc6a43124c29d9cff77ac127d2cee404c83168b4d2c
font_01_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 11068 bytes
SHA-256: 4efd081fa08bef9361d8f87b25e48f09d9fab122976414d34c9a4d9818e9dcc8

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