Malicious PDF — malware analysis report

Static analysis result for SHA-256 51580407e7441089…

MALICIOUS

PDF

72.6 KB Created: 2021-03-27 18:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1c381000d3fdf2b680b9ad1bcb36dd00 SHA-1: 228d47ecddd641772297cb7f3b58a02c1e2e9954 SHA-256: 51580407e7441089736cb86a86658acc40b472411d8583ea341598e10084549b
184 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It contains multiple embedded URLs, with a critical finding indicating redirection to known malicious infrastructure. The document's structure and embedded links suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or malware distribution. No scripts were extracted, but the PDF's nature and the malicious URLs point towards a phishing attack.

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/123?utm_term=sun+accounting+system+user+manual+pdf In PDF document text
    • http://dasuwupozu.22web.org/forming_linear_equations_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/dgyhbgi/76688029868.pdfIn PDF document text
    • http://fetiweresanamud.iblogger.org/will_would_exercises_with_answers.pdfIn PDF document text
    • http://gosufogirepejam.22web.org/unilorin_admission_list_2020_20.pdfIn PDF document text
    • https://xilasofuvi.weebly.com/uploads/1/3/4/6/134651230/75a1671.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/fguLeje/age_of_warring_empire_apk_offline.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/2283037.pdfIn PDF document text
    • http://bubobimurasawe.iblogger.org/buvexugemikal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_6033f2396062d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_600911a3e0514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_603778daf2119.pdfIn PDF document text
    • https://widajuzuno.weebly.com/uploads/1/3/1/6/131637349/8212623.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://uploads.strikinglycdn.com/files/6bb74024-722f-44ab-b64c-61bc11c8fd72/47018451490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1573b106-4466-4385-b48c-a797fd3b399d/what_year_is_my_clark_forklift.pdfIn PDF document text
    • http://vevemaj.rf.gd/lujikuzajixuvagudot.pdfIn PDF document text
    • http://vebavibokifoko.epizy.com/significant_figures_sample_problems_with_answers.pdfIn PDF document text
    • http://mulexotuvatago.epizy.com/pizokukisurakum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/431f6eb5-8c0c-4ec5-8dae-8b1ab8aa3ae5/sugokibatozepikepabewezex.pdfIn PDF document text
    • http://bukufam.epizy.com/pioneer_sph_da210_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ba948c5-ed39-40e4-8841-c9a806b2a84a/how_much_does_sat_prep_cost.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_off0000d350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD350 5564 bytes
SHA-256: 1180c656de0ef5b4e8f66b146cef0c2ea361d5cef26e62b9943784e4a2497cbd
font_01_sfnt_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 9640 bytes
SHA-256: 60d1f3003297701c1450f21dfe84b81da8e7f2685f1314f9601cc9cdcc7c6174
font_02_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361