Malicious PDF — malware analysis report

Static analysis result for SHA-256 12686c06f1fa74bd…

MALICIOUS

PDF

76.0 KB Created: 2021-04-10 16:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c6a36bab23eb41d314054045fb5bdead SHA-1: de45aa23c18a73a0a75cdc1ca8dd08e81cef431b SHA-256: 12686c06f1fa74bdb135f5cb306d187bb9c6c8829bb30cdb6b27c69c623c627c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('resalured.ru') that is flagged as an external URI. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=different+types+of+interior+design+styles PDF link annotation
    • http://nutusugeralinet.mypressonline.com/dream_on_aerosmith_guitar_tab.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/captain_underpants_full_movie_google_drive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461219/normal_60243aa07dfc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388427/normal_5fcf1664bcf1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500200/normal_5ff623198ee65.pdfIn PDF document text
    • http://sizegoduxuxa.mygamesonline.org/marketing_research_ebook.pdfIn PDF document text
    • http://suvonenexazu.mywebcommunity.org/chemistry_2nd_secondary.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/eb8d3d3a-23a8-4c24-8227-518100eb75d7/36393858174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481d84ed-746b-4941-9a24-fff149d9d400/35349414429.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_a00c39fe94d54f5aa105f18bec2dd4bb.pdf?index=trueIn PDF document text
    • http://dowinoxerirud.epizy.com/easy_printable_math_worksheets_for_kindergarten.pdfIn PDF document text
    • http://lurivukilurufex.epizy.com/duxakepugibap.pdfIn PDF document text
    • https://b0b8c8c5-0de0-49ea-8337-0a56b8a4e65f.filesusr.com/ugd/bf9dfc_dd60c228153141c484961c8e59c52ffb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e697bed0-4782-4120-9f95-18a891c710d4/salems_lot_remake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d71f36ce-3499-42b0-942b-339cda29acbf/17625789321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54154790-117a-435e-a149-9121bdb140fb/pl_travers_books_for_sale.pdfIn PDF document text
    • http://dodarululi.epizy.com/finudipij.pdfIn PDF document text
    • http://sokirasur.epizy.com/vipogumofudozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85805586-d9ae-40d9-b7ca-34f6e8aa51f2/jisuvar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0909a9-766f-4959-a150-7dda741c18b3/kogerisikikezuraso.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_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 5100 bytes
SHA-256: 2711ed6a54bba7256f95a62b6cd20d691ce2da3b9aa1f26433a25c4fb7370cf2
font_01_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 10880 bytes
SHA-256: b201e6c7398a9b8f984f7eea62200a8f9df486f097a21ef80a2a770e085695d6

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