Malicious PDF — malware analysis report

Static analysis result for SHA-256 9257488c4a2fd522…

MALICIOUS

PDF

79.9 KB Created: 2021-03-30 00:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5c483feddf6267c92273b68140e45b2a SHA-1: 9000881da22562cdf5c30b9fb03b5d619b157f16 SHA-256: 9257488c4a2fd522bfef0b951835d2506e8707405d1fa9c8a761fa1cb2630fd7
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The PDF contains a large number of embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection indicate a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=apa+manual+7th+edition+ebook In PDF document text
    • https://static.s123-cdn-static.com/uploads/4504791/normal_600002571fb57.pdfIn PDF document text
    • http://sethel.xyz/30687810289jqcoz.pdfIn PDF document text
    • http://ru-1.casa/10353152470j1kyh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472216/normal_60468511e595c.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/excel_indirect_function_reference_another_sheetcytvf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_600a9ec45afb9.pdfIn PDF document text
    • http://energytik.net/hp_laserjet_p3015_toner_ce255axblzj.pdfIn PDF document text
    • http://specrazreshenie.com/sifiwitedimutww1ib.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/out_stealing_horses_full_bookdpnqz.pdfIn PDF document text
    • http://wssummer.space/word_doc_tax_invoice_templatee61du.pdfIn PDF document text
    • http://bridgecommerce.com/vexolawor7hsn.pdfIn PDF document text
    • http://8gusevshop.space/62941302072xbay.pdfIn PDF document text
    • http://lifeeuro.info/the_fatal_conceitirzfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_6048ece3867d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423428/normal_5ff2e58aa2b0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_da9ef63c18124b92ae876622b2105057.pdf?index=trueIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_525afb7bf55244b3bb36affda230275b.pdf?index=trueIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_fdf33ad20a534325bab44a399c6abcc0.pdf?index=trueIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_bf51efae54f74a328a559bc74332ccf8.pdf?index=trueIn PDF document text
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_664a629cc3f245769d571b84ca3ba216.pdf?index=trueIn 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_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 5196 bytes
SHA-256: 74417a4374bdfc916a934be2794362ea4038ab9c9ea14caa611358d68cff0738
font_01_sfnt_off00010e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 10656 bytes
SHA-256: a7c0a235063b45226d24bc8fbe244ec2f76d3e33b384e06d8b8d7df63a390d9a

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