Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef52d2dd3f4f2a0…

MALICIOUS

PDF

78.1 KB Created: 2021-06-07 08:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b2ae1092d6772eb105f661541f7cf483 SHA-1: 5fcbeb0dd6357bca93356c5c86e5dd7475a6e6df SHA-256: fef52d2dd3f4f2a018add6494f2f1c132b173fcd764db31e720aa3fc01a599db
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with embedded URIs pointing to external resources. The presence of a 'download button' lure suggests a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate the download of a second-stage payload.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/pbw?utm_term=calculus+bc+notes+pdf PDF link annotation
    • https://bofuvuwowu.weebly.com/uploads/1/3/1/8/131856225/bokolofegaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_6015935d62ac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468255/normal_605acda760c4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_6046320cc9d23.pdfIn PDF document text
    • https://zetapowopes.weebly.com/uploads/1/3/0/8/130813904/lawozudakejura_wusamos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391896/normal_5fd3083537954.pdfIn PDF document text
    • https://viriparerari.weebly.com/uploads/1/3/5/9/135978168/4685455.pdfIn PDF document text
    • https://wituxilozixataw.weebly.com/uploads/1/3/5/3/135317309/tudupise-jasivovino-jaromumukozupom.pdfIn PDF document text
    • https://gapudozesaneg.weebly.com/uploads/1/3/4/5/134525911/sezemuguvosofuxineno.pdfIn PDF document text
    • https://nujamoxe.weebly.com/uploads/1/3/4/2/134234607/diwunovaperija-filubejapavub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_6049ae43b8da9.pdfIn PDF document text
    • https://fotavisemaro.weebly.com/uploads/1/3/1/4/131406710/5c4020fa.pdfIn PDF document text
    • https://ruwivogisi.weebly.com/uploads/1/3/4/2/134265822/2277ce57596.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/b54740cc-83b4-47d8-9de3-c47d84c08edb/construction_project_manager_salary_tampa_fl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74286fb-a422-43ef-8ee7-14063565c3fb/bipafipazugiroxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15dad291-1dfa-4bad-9abf-76dbdd587df9/what_the_hell_is_life_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f99b06fa-4507-41a7-84d4-8608130e3149/dibejaxiforone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b82f54f8-123a-4562-bbbc-dea182e0bd21/jepozidiralu.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_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 5096 bytes
SHA-256: 08e7722f8e616a0002b80ec91ce3b0bf75bc3cede3a34db5dd27d71e37c1fedb
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 11424 bytes
SHA-256: 82adf9948bd9c46bca8d95224b51b92a1bef42694507f9e17c1d77f7b6900a74

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