Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c58239a46f37bb8…

MALICIOUS

PDF

67.2 KB Created: 2021-03-07 17:01:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f6ce92c2708207a660e2f3517d7c93c1 SHA-1: 5aad368f37ff88b64d064e7398ff4eeb5a010129 SHA-256: 8c58239a46f37bb8dd458ee542493b2ff235e011ae645c3cc179fc0569bae283
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to a link farm, indicating a phishing or malicious content delivery attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest this is a phishing lure. The ML classifier and ClamAV detection further confirm its malicious nature.

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
  • 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://soxebez.ru/wix?keyword=force+and+motion+worksheets PDF link annotation
    • http://manaluw.iblogger.org/completion_report_of_construction_project.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/verb_plain_form_japaneseudpwz.pdfIn PDF document text
    • http://goxuvux.22web.org/talolivafujeliparudezuru.pdfIn PDF document text
    • http://olymptrade.buzz/9813508675442wrm.pdfIn PDF document text
    • http://proba7.xyz/le_malentendu_islamo-chrtien0f3a7.pdfIn PDF document text
    • http://chisto-chisto52.ru/81756239943j0qad.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/f6b05ca2-25ab-4bf4-ac94-bfd15fc9e0be/is_powerline_internet_good.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_7aeb6b4fe1274dcb8ab5d74eb3a43b2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c4e3082-f9b4-450b-8035-b8872366f500/yamaha_motif_xf8_61.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/adobe_professional_free_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cbbc8e-4d04-4efd-aa30-c703c782d245/argumentative_essay_about_school_uniforms_should_not_be_abolished.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_215a14ca5b4f474ab7772c963e1f59be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/povawivowijepo.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_91f75a38e31f43fb88d3c7a5aaf13f32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/rasusosenana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/118b777c-339e-448e-b048-243bf27ff8b6/87779702122.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_off0000c9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F4 5256 bytes
SHA-256: 7bf88157bb8c72f87fbe4c9cba4b113094343955b611426fa1afefbbee840f9d
font_01_sfnt_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 10616 bytes
SHA-256: bc5d64fb603c8e9fc44e2312d6587b63a9350fbf9223ce7fedf37ee18926be75

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