Malicious PDF — malware analysis report

Static analysis result for SHA-256 66098f86d58632f3…

MALICIOUS

PDF

85.4 KB Created: 2021-03-24 06:03:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ddf2c1cf4ddee960a786bb4b0aa2d716 SHA-1: a4ef03f9936e0ab2bb9117d789d7499a17c358be SHA-256: 66098f86d58632f39f27e891680b753916a0a866642932411e09ccfaa30086df
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click on these links, which likely leads to phishing pages or further malware downloads. No scripts were extracted, but the presence of numerous suspicious URLs suggests a malicious intent to redirect users.

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
  • 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=geraldine+high+school+uniform In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_604ae4e4c7426.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/best_neve_1073_copys0nzt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_60279247e0f90.pdfIn PDF document text
    • http://prodson.space/delta_11-990_keyless_chuckexji3.pdfIn PDF document text
    • https://rajilogibakew.weebly.com/uploads/1/3/5/3/135326989/kefupaban-zikonawaza-xofok.pdfIn PDF document text
    • http://lazadacostumercenter.com/xaketukajisikabatibevq658.pdfIn PDF document text
    • http://urott-hu.com/94782255147qtrd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_602a44c517ee4.pdfIn PDF document text
    • http://get3creditscores.info/kikemudutatuwesumi83nap.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/boxosot.pdfIn PDF document text
    • http://whalesqpa.fun/area_and_perimeter_of_triangle_worksheetfhvus.pdfIn PDF document text
    • https://bikezurikol.weebly.com/uploads/1/3/4/6/134612173/vugiwoki_tefowujulozar.pdfIn PDF document text
    • https://tivagirususu.weebly.com/uploads/1/3/5/3/135350390/1812224.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/28ce15d3-0bb9-4224-aeea-1cd72b1b11ea/25591382250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72dcff03-ae18-4700-98d0-1aad74c82e7b/misubukasobagipobuwas.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/charles_dickens_hard_times.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/33369673134.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/adjectives_exercises_for_class_4_with_answers.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_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 5468 bytes
SHA-256: 74064e8eb965f61e0abdd75039766f1128cfba2b7cf4b0064f147324321fbcec
font_01_sfnt_off00012136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12136 11700 bytes
SHA-256: e8ed89f23d65827926ada0b783efcf8cef0e07afe6dac1e8e3163233fa3850b9

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