Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f944617515c204…

MALICIOUS

PDF

83.8 KB Created: 2021-03-05 09:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 59a08d439d01d7439e0593144e2acba2 SHA-1: 202492af14cefa739cb092b183524c51b30d5d15 SHA-256: 48f944617515c20465e826724bcdfda78c734c7bc9e823a5333a77090d0a98c0
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL pointing to a domain flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or scamming operations. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=jerarquizaci%25C3%25B3n+de+valores+seg%25C3%25BAn+max+scheler PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386074/normal_5ff92fc706988.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/4854041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460686/normal_601aef9be32d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446915/normal_5fcca7051ca06.pdfIn PDF document text
    • http://hardcreditcheck.info/68607737169iyfoq.pdfIn PDF document text
    • https://jukuzowak.weebly.com/uploads/1/3/1/3/131379830/8408994.pdfIn PDF document text
    • http://viewcreditscore.info/peligumogdnj4.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/d5sd9Sk/sixoxomofoxetusopekoxomun.pdfIn PDF document text
    • http://power-guard.shop/business_intelligence_for_dummiesai3eo.pdfIn PDF document text
    • https://dikubudekoguzo.weebly.com/uploads/1/3/1/8/131857294/09782de.pdfIn PDF document text
    • https://gilaxaled.weebly.com/uploads/1/3/1/4/131438091/woxajore-xawaz.pdfIn PDF document text
    • http://nashremont.site/fringe_tv_series_hdb3zuc.pdfIn PDF document text
    • https://bizutimuja.weebly.com/uploads/1/3/3/9/133999747/bofuxegig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483361/normal_5fe2bfd97c1ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466386/normal_5fdd92687343f.pdfIn PDF document text
    • https://cdn.sqhk.co/wagejino/OEggjf8/64928475768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/93de4b15-5447-4360-9d56-d8a8bae91954/94272458825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c4232ed-93c7-43cd-8081-be028a6b8310/52958405502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ddcaf5-4367-4659-9c1e-497eff1ebfa3/logajoruzavawivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15943fe1-ea90-4123-9fa3-1a1959c09ac0/sirudopodifozazaruj.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_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 5896 bytes
SHA-256: 31258b0e1780a8ab7e4a2f85ae62fbfd8d2bc6a3ab40dade58f3c527d7fa0af3
font_01_sfnt_off0001197f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 11756 bytes
SHA-256: b93bd35b163dd159a24112a5f08da14d5ddbb6d7a8f686dafb6d3a52ebc56974

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