Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ad20e18451e749…

MALICIOUS

PDF

82.0 KB Created: 2021-04-02 14:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b23cf54b0322eb7ea50d5fb400e8c707 SHA-1: 9deddb4cefeeee2143e5cf76a6f0fe9bd9761f6b SHA-256: 38ad20e18451e7499cfb67a7044c1e1ba1a5932db61b72c50f9b69f15d02fc8d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs, such as http://esmoney.site/ocl2_electron_dot_structurez3ba0.pdf, are indicative of a downloader or redirection mechanism.

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://leonvi.ru/strik?utm_term=us+stock+market+closed+good+friday PDF link annotation
    • http://esmoney.site/ocl2_electron_dot_structurez3ba0.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://fipopogukol.iblogger.org/orca_oxford_bookworms_starters.pdfIn PDF document text
    • http://rerubin.space/laura_knight-jadczykgs0x4.pdfIn PDF document text
    • http://artdebug.site/suxibufijewo584bq.pdfIn PDF document text
    • http://presalon.xyz/76211884038m6dq0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_9a9086901d4740c49de9bdd5c43197e6.pdf?index=trueIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_0a4be0195d7949a68f213390315b822b.pdf?index=trueIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_d31ce25ac5d344b0925556499b47ecf1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tevigotu/44697511145.pdfIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_414cf06434484545948c09c0b74593fa.pdf?index=trueIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_7462b1962c554de9a4b18470c4d7df95.pdf?index=trueIn PDF document text
    • http://mexefesu.epizy.com/kiromogadiwobikinir.pdfIn PDF document text
    • http://sokevigaku.rf.gd/dofukogor.pdfIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_664e3ea335f24f2ca5662020732d8091.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/work_uniforms_online_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/escala_de_braden_q_para_pediatria.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_ae6c56cd941b45a882f2cbe1eb3c5858.pdf?index=trueIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_0335b86295ef41e799d991c69573d20c.pdf?index=trueIn PDF document text
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_e79f9f5f80c54d45bdc525ecc84198b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rejiner/cabinet_ministers_of_rajasthan_2019.pdfIn PDF document text
    • http://sipikoz.epizy.com/zitebevozusufine.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_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 5496 bytes
SHA-256: 7ccb64c3216eb2fbad1d5f45c966d5b25ac78e1b8e838f2c37ac24864074234a
font_01_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 11608 bytes
SHA-256: 6ff8cee0eb9a0b4560d7bcbb43b3350a33ffbdab0f71b7ad81b5dfb5d18808d8