Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0cb0f32e99005a…

MALICIOUS

PDF

77.2 KB Created: 2021-03-24 06:06:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2ad1fb56c2a41b4956683f630df79a6c SHA-1: 5194f343f12de947dbe8a49ee9920fab8c57a060 SHA-256: 3a0cb0f32e99005a36de1113dfe7ff469320a6159bbbc1e0316fa05df63880a1
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://leonvi.ru/strik?utm_term=how+to+write+a+good+feature+story PDF link annotation
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/bililesimosi.pdfIn PDF document text
    • https://juxapokidopelif.weebly.com/uploads/1/3/1/6/131606881/pusivugavakesov.pdfIn PDF document text
    • https://saxuvelimeno.weebly.com/uploads/1/3/4/4/134480096/vegasexuves.pdfIn PDF document text
    • https://vaguvijag.weebly.com/uploads/1/3/4/6/134610999/110be122062ad.pdfIn PDF document text
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/podumozirizoxurekit.pdfIn PDF document text
    • https://gilotimo.weebly.com/uploads/1/3/4/8/134899899/d8478b4.pdfIn PDF document text
    • https://dumuzuvo.weebly.com/uploads/1/3/4/6/134695275/f24692059ba08.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/6398259.pdfIn PDF document text
    • http://by-roof.ru/36307575986g3x79.pdfIn PDF document text
    • https://vomedizi.weebly.com/uploads/1/3/5/3/135312409/jefexu.pdfIn PDF document text
    • https://xodukibefapox.weebly.com/uploads/1/3/0/8/130873769/nudalujixavisa_wogexasud_zopisazumuf_xubaxir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_6019a74ec2538.pdfIn PDF document text
    • https://tupodawemizaz.weebly.com/uploads/1/3/4/5/134594588/89f5e.pdfIn PDF document text
    • https://xuzubakew.weebly.com/uploads/1/3/0/9/130969304/wolasimazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_604494518482d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449614/normal_600280d4ec1f6.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/zesupovivuzezos_takegu_lutivemubugonon.pdfIn PDF document text
    • http://mestorating.ru/dakvilt_op_basis_van_asbest44ua9.pdfIn PDF document text
    • https://sexitikimuzulab.weebly.com/uploads/1/3/5/2/135296232/semutosikazetegufiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_48405816a2f946a5aac3a7f28b2b5035.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_8c07306f29854ee2ab53e38fff2c486c.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_ff33424056c5495cbbfd0d6fc9d2e47b.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_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 5200 bytes
SHA-256: c714b9011c16cd90d6d91f3d73740f71d1faa5d19c6fec175adc0c874b86452d
font_01_sfnt_off0000fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 11364 bytes
SHA-256: 7ffca3017de9745ba5350e2779b9d0467d50fda2eedc34bc0cb14fc8dac26bd7