Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40e102723dd968a…

MALICIOUS

PDF

80.5 KB Created: 2021-06-10 13:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5b858886e4e9735ed139c59c14666150 SHA-1: 3f0bde6a8e76224f3fc4e186aa6471faa132f6b1 SHA-256: f40e102723dd968ab42d499d45f6e05fe6bd8b9a845c3e59af118e07d168ce4c
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to software activation codes, likely serving as a lure to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/pbw?utm_term=intellij+idea+ultimate+activation+code PDF link annotation
    • https://xurajozut.weebly.com/uploads/1/3/4/3/134371968/lomok.pdfIn PDF document text
    • https://bisuduroj.weebly.com/uploads/1/3/4/7/134714880/18bad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_605dd9f32de0a.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/6017422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_606c786c6c57e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_6044db87bf27f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_6037a3c849b72.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/webusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_5fd93898920f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_600c9a22e1bf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488566/normal_6011bb156f353.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418399/normal_5fde73567080f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477892/normal_5fe51d77c22f0.pdfIn PDF document text
    • https://simogewijak.weebly.com/uploads/1/3/4/6/134642120/gekopo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_603af4b669eec.pdfIn PDF document text
    • https://siwevobone.weebly.com/uploads/1/3/5/3/135317475/ritusuvivelin.pdfIn PDF document text
    • https://nebekateri.weebly.com/uploads/1/3/1/1/131164314/d450031.pdfIn PDF document text
    • https://noxesole.weebly.com/uploads/1/3/4/6/134615833/jodavijikuxan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406473/normal_5fee2da7c9852.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391899/normal_5ff9dfd646937.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://masawumel.pbworks.com/w/file/fetch/144869379/planeacion_de_clases_de_computacion_para_primaria.pdfIn PDF document text
    • http://vakerul.pbworks.com/w/file/fetch/144492246/hill_climb_racing.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/w/file/fetch/144802026/sniper_assassin_3d_apk_android_oyun_club.pdfIn PDF document text
    • http://dejimebez.pbworks.com/w/file/fetch/145021653/puvevedipezomajapawaripu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 4768 bytes
SHA-256: 0fac0f1877d048d4ef30efe01389da6ae45b85a84329897c7cde4c4b665a914a
font_01_sfnt_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 12756 bytes
SHA-256: 6525682c1657811e6484fe0166eaebc87d07bf52700d59837fc21eaf5716e4d9
font_02_sfnt_off000125f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c