Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa58ed47d3f07ffe…

MALICIOUS

PDF

79.1 KB Created: 2021-04-02 14:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b7d5649da4c69ae39e92bb884423db70 SHA-1: 5fdd6327616aff73fe39b4620ad71469a207e66e SHA-256: aa58ed47d3f07ffe1ea21ac959baec497333325f58a1bef930917b63ab8e4745
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including invisible links to suspicious domains and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The embedded URLs are likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://golowaki.ru/wix?keyword=is+stubhub+reliable+reddit PDF link annotation
    • http://xavelodezazil.iblogger.org/procedimiento_disconformidad_alta_medica_inss.pdfIn PDF document text
    • http://normaa-id.com/promag_mini_14_10_round_magazineci6k7.pdfIn PDF document text
    • http://turosofatilez.iblogger.org/pijozo.pdfIn PDF document text
    • http://5-euro.info/pipeline_tech_jobs_in_north_dakotahholk.pdfIn PDF document text
    • http://zabafijazone.iblogger.org/ziwafenijelazok.pdfIn PDF document text
    • http://converstarget.ru/amoeba_sisters_alleles_and_genes_answer_keyhlgf2.pdfIn PDF document text
    • http://managerprogram.live/vazekasijujuximifodawxm0v.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://musc-media.xyz/mabirifgp69t.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://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_c0b45a41ad374f37b4414218f9a8e363.pdf?index=trueIn PDF document text
    • http://duginuj.rf.gd/altivar_28_manual_espaol.pdfIn PDF document text
    • http://molobexe.rf.gd/intelligence_test_questions_with_answers.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_844bcd282be94da28d786417a7e9c678.pdf?index=trueIn PDF document text
    • http://wopugizejaru.rf.gd/76197712778.pdfIn PDF document text
    • http://nujovelu.rf.gd/difference_between_taurus_g2c_and_g2_millennium.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/68832824183.pdfIn PDF document text
    • http://xesidif.epizy.com/cefr_english_test.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/cajamarca_turismo.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/costco_spiral_ham_directions.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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 4656 bytes
SHA-256: 793c65f8d62c6cbaecbdfca3124984687dd6a23630b1aaba7f2348b49a1884f7
font_01_sfnt_off0000fb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 11200 bytes
SHA-256: 14ee77af868c8a16f90ed962a98bb54d729bf8e94a7e6682e5a97e96972e4136
font_02_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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