Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55f882e3128345d…

MALICIOUS

PDF

76.3 KB Created: 2021-06-03 21:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8bb955cab70207be89b8563c3defc8a5 SHA-1: 832bea7f66ea35ab215d22034cd85af46cf6fc35 SHA-256: d55f882e3128345de3b05678245523e9198fbcf551cfb7b838f0f5314359ca18
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting and utilizing UTM parameters, which is characteristic of link farms or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=mobile+phone+wallpaper+gif PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383304/normal_6042c5423d716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_604431ead5d8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461773/normal_604f495c8066e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488335/normal_5fdbe3bff10df.pdfIn PDF document text
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/tizixixokataxob_jalugulurivuji_ravufapi_fukazobe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446038/normal_5ffa772d7c07f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365649/normal_5ff1cc1f455ba.pdfIn PDF document text
    • https://wuzijitegufizu.weebly.com/uploads/1/3/5/3/135320378/2719832.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4404524/normal_60b06c7f24e78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467318/normal_606c84e2b015a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387433/normal_6044cc83891cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pusavivo.pbworks.com/w/file/fetch/144448407/centrifugal_compressor_maintenance_manual.pdfIn PDF document text
    • http://fuzobonesujo.pbworks.com/f/puvadudafefuxo.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/w/file/fetch/144476025/45976339388.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144413766/galudovujevibujonefi.pdfIn PDF document text
    • http://fajopab.pbworks.com/f/1733593778.pdfIn PDF document text
    • http://gupiguna.pbworks.com/w/file/fetch/144554958/istruzioni_videocitofono_bticino_classe_100_v12b.pdfIn PDF document text
    • http://bowawesup.pbworks.com/w/file/fetch/144535065/suicide_squad_full_movie_download_in_hindi_ipagal.pdfIn PDF document text
    • http://noxixap.pbworks.com/w/file/fetch/144426066/89412824450.pdfIn PDF document text
    • http://xujefix.pbworks.com/f/zizevekofug.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_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 5220 bytes
SHA-256: 91409978eca52f35e3863a5d8f2d406f110bfd389d40b3294eb5d87582583d70
font_01_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 10584 bytes
SHA-256: c33711daee1aa6de4e639aab5989116026a9bbed63caf26b813aeceb67934699

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