Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95cd3694d97db88…

MALICIOUS

PDF

75.0 KB Created: 2021-06-09 05:39:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 00cc465eb96fa8e91abe4be599776fba SHA-1: 51c78efc18d1091238ea6ae597bfdb333a7dd855 SHA-256: e95cd3694d97db88078b54642ecf8ca753331ebe21a7225d334b106ae286be6d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://jumiwimov.ru/123?utm_term=remember+us+this+way+sheet+music+free PDF link annotation
    • https://vukexelisijaka.weebly.com/uploads/1/3/1/0/131070195/zekopawegufikonugis.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/lepelafarete.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482623/normal_5ffe547c25c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_60399568b9484.pdfIn PDF document text
    • https://bitilidejiv.weebly.com/uploads/1/3/4/4/134442737/lojusojiwiruzakonam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498404/normal_5fc9d9c93dab9.pdfIn PDF document text
    • https://dorigobumin.weebly.com/uploads/1/3/1/3/131384291/2913888.pdfIn PDF document text
    • https://sonolinezib.weebly.com/uploads/1/3/0/8/130874018/625398.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407780/normal_602eb77eb5dc0.pdfIn PDF document text
    • https://guxodovuze.weebly.com/uploads/1/3/4/3/134333652/bomesofopop_kuxajewafeb_wewesukowumasu.pdfIn PDF document text
    • https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/9623981.pdfIn PDF document text
    • https://wonimigapikil.weebly.com/uploads/1/3/7/5/137509794/demod-mubupepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_601fd4e4ebed8.pdfIn PDF document text
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/9499e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416304/normal_6035b024558db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_6053adea35715.pdfIn PDF document text
    • https://feraresafobigim.weebly.com/uploads/1/3/0/8/130813798/c8cd15969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426075/normal_604d2d64d0dfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_601f63e3b72b3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4485305/normal_60b4ceed661eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ronefete.pbworks.com/f/muzajurajekogigogifuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd8d34be-238b-4de1-a808-11c02fd28de4/24588607694.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/safabonekibiligan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe6f995-3931-4841-8d85-4d6911881c15/the_tipping_point_malcolm_gladwell_en_espaol.pdfIn PDF document text
    • http://beratirupo.pbworks.com/f/headway_english_b1_students_book_pack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/540093b1-b421-41f1-a4cb-30edbc112668/5756185799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd8f619-8a97-407d-b49c-491b93287a10/pasos_de_la_misa.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/w/file/fetch/144545556/jikedimejajilenejagoxaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ddb219-f949-462a-a09d-4264197f78a9/sisterhood_is_powerful_shirt.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_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 5432 bytes
SHA-256: 3a28c076358740697e4853c342dd5f6fd92ea2c8973293e88cf7252b3b05ce01
font_01_sfnt_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 10668 bytes
SHA-256: ca1947126d780f4821a924f5bb0fc4e3734cda46efb41335c96abdcf45cb279f

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