Malicious PDF — malware analysis report

Static analysis result for SHA-256 3187cb0fc162ec9b…

MALICIOUS

PDF

75.7 KB Created: 2021-03-07 21:55:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dd014c6822bc56644189c8e6b391ca02 SHA-1: 4aeb30d2953607187d11d64ecd5dad7ea4e6b11c SHA-256: 3187cb0fc162ec9b24b68001a48d597648845d1d4aa8db53f2a076bf2ec09e90
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a phishing or malware distribution scheme. The ML classifier also returned a high confidence score for maliciousness. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

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
  • 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://kuzutuzo.ru/strik?utm_term=should+i+train+chest+and+triceps+together PDF link annotation
    • http://kerutugizuxig.mygamesonline.org/wazijimojudupisuko.pdfIn PDF document text
    • http://uablog.site/kindergarten_worksheets_counting_to_1006qux8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_603c1e50ca2ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5fcb298425fe4.pdfIn PDF document text
    • http://policyhelpcenter.com/carols_by_candlelight_2018_melbourne_tv_guidefucoq.pdfIn PDF document text
    • https://kowagazobavov.weebly.com/uploads/1/3/0/8/130874359/9633000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421768/normal_5fc92442c6f9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401714/normal_5fc914d1d2f13.pdfIn PDF document text
    • https://roxodebovak.weebly.com/uploads/1/3/1/4/131454305/jadexodar_jaduwoj_mowavujez.pdfIn PDF document text
    • http://coloradocustomelectric.com/b._ed_entrance_exam_form_onlinecotpm.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/jeGghvK/music_lines_and_spaces_acronyms.pdfIn PDF document text
    • https://wigazasadus.weebly.com/uploads/1/3/5/9/135974004/7297277.pdfIn PDF document text
    • http://memisada.mygamesonline.org/osmolarity_potato_lab_report.pdfIn PDF document text
    • http://rastet-malysh.ru/46941645713y1f43.pdfIn PDF document text
    • https://sosijujanakuf.weebly.com/uploads/1/3/5/3/135387992/6414519.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/idjcjji/history_of_bladder_cancer_in_situ_icd_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_603960b5d652e.pdfIn PDF document text
    • http://smm-target.ru/que_es_una_unidad_didactica_en_educacion_infantilpwm7p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejimafalun.onlinewebshop.net/how_to_write_biology_lab_report_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4ff011-9672-4204-bcd6-9a21cbd62893/foxipejipotegem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2246de21-c047-4d15-9f5c-6dd8c16a0179/xokozobetokab.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_off0000e9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E7 5436 bytes
SHA-256: 5abee2bde9929110cc050597d8689454fe406fe118c5fcfc744cf1a27b82d96e
font_01_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 10884 bytes
SHA-256: 8fc78dd733f7e529641bb1640c0eb9a11d37db41230c325b1a54d9ec715df4ea

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