Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee3b0f488d41ec2…

MALICIOUS

PDF

75.0 KB Created: 2021-02-22 20:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 26ac2529485aff371e0ef41b1cbfeb37 SHA-1: 7536abad42746c7602d0ad15a8fc2bebb2b2187c SHA-256: 8ee3b0f488d41ec26bf2553b857603318fe2de8b3dcf74999a392a7df6ca5ed5
214 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of embedded URLs, many of which are identified as malicious redirectors. The ClamAV detection and ML classifier also indicate maliciousness, specifically related to phishing. While no scripts were extracted, the sheer volume of malicious links suggests an attempt to direct users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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://crophysi.ru/123?utm_term=neuropsychological+test+report+sample In PDF document text
    • https://cdn.sqhk.co/zoluxoni/WJVNOig/supamev.pdfIn PDF document text
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/duvewitivunavedajub.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/Kn8WHje/57214738954.pdfIn PDF document text
    • http://opencabinets.xyz/seven_myths_of_the_spanish_conquest_analysisqe8j0.pdfIn PDF document text
    • http://cosmeteca.com/what_are_gross_motor_activitiesa0255.pdfIn PDF document text
    • http://aarbuz.space/mp_bsc_bed_application_form_2019ipac5.pdfIn PDF document text
    • https://zefivevolexu.weebly.com/uploads/1/3/1/6/131637056/foxegape_xevawugitatogi_gevomotexolota_jexidi.pdfIn PDF document text
    • https://jipowikufimur.weebly.com/uploads/1/3/5/3/135327107/kevopesigase_bakajob.pdfIn PDF document text
    • http://onlineeshop24.xyz/o_nascimento_da_biopolticandjcs.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/fhhgeex/tiptop_audio_mantis_cover.pdfIn PDF document text
    • https://xejukogafowoje.weebly.com/uploads/1/3/2/6/132682905/nezel-xagiwufuroz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lebejos/equivalent_ratios_and_graphs_worksheet_answer_key.pdfIn PDF document text
    • http://povusesa.rf.gd/72376276027.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/kufufagawisexinefibutit.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/nilakisi.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/battery_saver_pro_2019_apk_free.pdfIn PDF document text
    • http://biviroromu.rf.gd/how_to_become_a_successful_operations_manager.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/standard_deviation_excel_sheet.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_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 5420 bytes
SHA-256: b6f561cf593eb4814e1bfa1cada2f10fee1814cb96dd14525887e55179cb6bf6
font_01_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 10760 bytes
SHA-256: 97897305f9a35de130aceda1da959a1bbc24afbc2f029f7e156cab51831deb98

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