Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b83f033ff1f4008…

MALICIOUS

PDF

71.9 KB Created: 2021-02-28 01:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 356b60ec4bfae1247d0394b98d11a2ab SHA-1: 93dcd7a0dd4adf53ec16b4e17601ae9ee737b637 SHA-256: 4b83f033ff1f40088b1b0f7870ed93adbc81767b59804d5c90fee789aa12321c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://resalured.ru/wix?keyword=coin+master+cheats+without+verification PDF link annotation
    • http://italy50wow.pro/34271792153nlt3u.pdfIn PDF document text
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/xilunizadete.pdfIn PDF document text
    • http://muvariwiporiju.iblogger.org/uitzending_bijwonen_formule_1_cafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450428/normal_60293ec881eb6.pdfIn PDF document text
    • https://kadeborejegan.weebly.com/uploads/1/3/2/7/132740978/8290527.pdfIn PDF document text
    • http://shoop-fl.ru/how_to_vacuum_stairs_with_dyson_ballctl56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_60373a8ca3651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5fdab2c268c33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394068/normal_600cceb727885.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/trane_xr90_replacement_partslayms.pdfIn PDF document text
    • https://mokazeke.weebly.com/uploads/1/3/1/3/131384082/wunulanoduwej.pdfIn PDF document text
    • http://lowuwirakob.66ghz.com/how_to_show_data_on_pie_chart_in_excel.pdfIn PDF document text
    • http://kalavar.xyz/stramatel_scoreboard_manual11811.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuxomexepus.epizy.com/application_letter_sample_for_teacher.pdfIn PDF document text
    • http://wawaxujogoned.rf.gd/how_to_fix_maytag_front_load_washer.pdfIn PDF document text
    • http://tuguwobafadurot.rf.gd/bca_finance_annual_report_2016.pdfIn PDF document text
    • http://vulewibof.epizy.com/doctor_id_card_template_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 5148 bytes
SHA-256: b83f11f48bacf5fab38ce0a7fa7569b664b21e228b84f8d4d2b6c6cd1b871cbe
font_01_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 10208 bytes
SHA-256: 6c72f261d7f4ba5fe8caaeb1691b71887de170992a024454152519a1f785c4b1

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