Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04ec4bd2b12328d…

MALICIOUS

PDF

76.8 KB Created: 2021-03-29 07:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: efe55e6fb223cb6403f644afac3d3876 SHA-1: 1774ba0eb73eef1d52b57fd73625bfa77b04285d SHA-256: b04ec4bd2b12328d1ecaa48020585abd7701dab218b93d37c5fc967676d5ef29
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=wu+tang+saga+season+2+date In PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_6013af72ca47e.pdfIn PDF document text
    • http://bestplacefor.rest/8977159298485w1i.pdfIn PDF document text
    • http://wowofiluze.22web.org/rozawewovojize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_603e75e3e75ac.pdfIn PDF document text
    • http://wopivobozas.66ghz.com/form_20_final_result_sheet.pdfIn PDF document text
    • http://safagiko.iblogger.org/gedujivuzabutarowi.pdfIn PDF document text
    • http://termometr-medikal.site/garudegoruvugudifuvobogek0grxb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5fda67658b8ee.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
    • http://boluwugotesuni.rf.gd/bluebeam_tutorials_2018.pdfIn PDF document text
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_8e9918b42a4b4987839b50f757cbdfad.pdf?index=trueIn PDF document text
    • http://tifalupu.rf.gd/the_alchemical_table_of_symbols.pdfIn PDF document text
    • https://926fca10-1439-4adc-b819-38dad5327275.filesusr.com/ugd/26d6d3_d61093d887ba495987603dcdc5c9ade8.pdf?index=trueIn PDF document text
    • http://lesunew.epizy.com/pabugivajawedo.pdfIn PDF document text
    • http://xixupokolaxusuv.epizy.com/ejercicios_asientos_contables_resueltos.pdfIn PDF document text
    • http://gapusamini.rf.gd/sokedutezaboxedogizijenem.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_b2b870aeb2464413afc9a4dae37a559a.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_a54d8ff4da324a89b55228df7e9638b7.pdf?index=trueIn PDF document text
    • http://rukawinasi.rf.gd/alto_saxophone_jazz_etudes.pdfIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_aa50642f4cb24674b070e17dd084a001.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 4844 bytes
SHA-256: 5aff4b2c4cb870a0bc7c0d7ae58d5f49a3d8707f2845f467b2287e01c3a9c535
font_01_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 11056 bytes
SHA-256: 9345e6dcf01e575e6b668ea6389dd758e8bb195ae8ae4ec3a86e4302aa6123f3
font_02_sfnt_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

Open this report in the interactive analyzer, or submit your own file for analysis.