Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1ca17149f39b64…

MALICIOUS

PDF

139.7 KB Created: 2021-02-02 17:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8b5fc96666c838f3fe39ac907ef055d1 SHA-1: b6096e94ba9d3a34fff3607a51070f2dff3f15c9 SHA-256: 5f1ca17149f39b64fb899f2b62102f3bbe0fb80cfbdbe5403d206fbcc2cf0efd
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with critical heuristics indicating it functions as a malicious redirector. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack vector appears to be directing users to potentially malicious sites via embedded links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/aws?utm_term=ktvu+channel+2+news+reporters In PDF document text
    • http://vamoktin.ru/persona_4_quiz_answers_ps21ihbf.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/cac674a1dfb346.pdfIn PDF document text
    • http://plsale.pro/air_canada_app_for_android8sz35.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/Ygghigi/cbha_othello_wa_jobs.pdfIn PDF document text
    • http://vlada4.xyz/hoverboard_in_store_pick_upentpt.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/Igfphh5/tewufojixum.pdfIn PDF document text
    • https://nulodikoz.weebly.com/uploads/1/3/2/7/132740439/vufetoz.pdfIn PDF document text
    • http://hackins.site/75142811130xerlb.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/cecje9U/yellowstone_cast_lloyd_age.pdfIn PDF document text
    • http://vengriya.space/nekilevewosumovodopimijn0gc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://turegipamikum.epizy.com/finativokexof.pdfIn PDF document text
    • http://sopazanit.rf.gd/logujozodafunipaziw.pdfIn PDF document text
    • http://fakodesugi.epizy.com/econometrics_by_example_free.pdfIn PDF document text
    • http://nomapalugaji.epizy.com/spring_waltz_mariage_d_amour_sheet_music.pdfIn PDF document text
    • http://zutotakome.epizy.com/clair_de_lune_sheet_music_easy_piano.pdfIn PDF document text
    • http://lelekon.epizy.com/play_script_template.pdfIn PDF document text
    • http://gitipezusev.rf.gd/45947059476.pdfIn PDF document text
    • http://xotepugiz.rf.gd/dewalt_xr_circular_saw_manual.pdfIn PDF document text
    • http://kebafitesulodu.epizy.com/answer_interview_questions_you_don_t_know.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_off0001e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3D1 5276 bytes
SHA-256: 0f8a38f43834833646e653f6f47759aac02c05696be94cb9879ff6de58adede7
font_01_sfnt_off0001f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5DC 12940 bytes
SHA-256: f75b22a6d48c209c9a3d03cc4402e66dfc3202c60c157fc28bd4196f1e768ff1

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