Malicious PDF — malware analysis report

Static analysis result for SHA-256 301bdef42833d657…

MALICIOUS

PDF

79.5 KB Created: 2021-05-02 11:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 66b38925c30589998e10800aae45d7d5 SHA-1: dab182b34d5344eb8049776d843f74a42cf6717f SHA-256: 301bdef42833d657e67c9c8343d3af04f36cc9f39e6b7e2901fd4cefdfa820ab
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one pointing to a link farm on disposable hosting, suggests an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to unlocking a device, which is a common lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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+unlock+asus+memo+pad+hd+7 PDF link annotation
    • http://vanimerukaguto.scienceontheweb.net/savafib.pdfIn PDF document text
    • https://galafibokuwi.weebly.com/uploads/1/3/4/8/134868726/luvavidebesusaw_vunilosufisit_puwun.pdfIn PDF document text
    • http://xudisoda.66ghz.com/34527105591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_604d1351e483f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_602e0c148be40.pdfIn PDF document text
    • http://tamigome.scienceontheweb.net/annual_internal_audit_plan.pdfIn PDF document text
    • https://sunawakajisume.weebly.com/uploads/1/3/4/3/134324988/4d81572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369771/normal_606578a51a1eb.pdfIn PDF document text
    • https://reledizov.weebly.com/uploads/1/3/0/7/130775001/verepatedinan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470698/normal_603a9d7b1d820.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_a46211c5feeb4ddaaa8c8262551690d8.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_e741407fe3a64a43a043562b60e837d8.pdf?index=trueIn PDF document text
    • http://rumobejijavof.rf.gd/acca_f9_kaplan_exam_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/merriam_webster_apk_paid.pdfIn PDF document text
    • http://motatowavem.epizy.com/deferred_tax_calculation_in_excel_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/personal_finance_exam_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/fisher_funds_management_limited_annual_report.pdfIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_23b1a8c5b6644a6caacea8d1e1f5ae7b.pdf?index=trueIn PDF document text
    • http://wesovipimamino.epizy.com/beyond_the_edge_2018_english_subtitles.pdfIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_68c031310a3f4357a42283087a44b19f.pdf?index=trueIn PDF document text
    • http://jujobope.atwebpages.com/pdf_bestanden_samenvoegen_tot_1_bestand_gratis.pdfIn PDF document text
    • http://rabelame.atwebpages.com/79282189455.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 5248 bytes
SHA-256: 94dc1cfa1d4d67ee987be0d796ca9da28bebf42c11ce5f5671f4b89d39204189
font_01_sfnt_off0000fe88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 10588 bytes
SHA-256: b1d8fa8e689efdd783f1ed3f412eaa1c88bf4ea961cfeb67ff7d54b393626bd6
font_02_sfnt_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3