Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d6973508125eda…

MALICIOUS

PDF

66.8 KB Created: 2021-04-01 21:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2478fb571f936485f1cf9d55738050b8 SHA-1: 38fa7b4db4fe5f54dde08bb7afa7a284844e7b02 SHA-256: b9d6973508125edaeb80f5475a806451887ab69e34459494c2bb2a53bf7bca15
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm hosted on multiple disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs, particularly those on disposable hosting, suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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 http://sinomefonok.mywebcommunity.org/romantic_bedtime_stories_for_girlfriend.pdf In PDF document text
    • https://vituxusupodewe.weebly.com/uploads/1/3/1/3/131379836/b52483480d6ac28.pdfIn PDF document text
    • https://zabagazepag.weebly.com/uploads/1/3/4/4/134498959/zopebisewewinop.pdfIn PDF document text
    • http://tejitotu.iblogger.org/xefedigofivefex.pdfIn PDF document text
    • https://nigerizebamogut.weebly.com/uploads/1/3/4/5/134596745/burexagaxabip.pdfIn PDF document text
    • http://molalozigiwev.iblogger.org/jijamilujewik.pdfIn PDF document text
    • http://rimiripa.mypressonline.com/us_passport_application_fillable.pdfIn PDF document text
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/a1cd82966a8.pdfIn PDF document text
    • https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/9076178.pdfIn PDF document text
    • https://jupagefux.weebly.com/uploads/1/3/1/3/131398252/aa566d5.pdfIn PDF document text
    • http://buxewufa.iblogger.org/mijurunoxin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Ecv9gJ3Ok6E/wb?keyword=introduction%20to%20flight%208th%20edition%20solutionsPDF link annotation
    • http://jirunogi.rf.gd/darkness_rises_game.pdfIn PDF document text
    • http://puwovejivu.rf.gd/balance_sheet_of_amul_company_2016-_17.pdfIn PDF document text
    • http://dusekamalebe.rf.gd/campbell_biology_2nd_canadian_edition_free.pdfIn PDF document text
    • http://kusababi.onlinewebshop.net/fijijani.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_00892fb7d7654faca1d8e101b82659bb.pdf?index=trueIn PDF document text
    • http://zafuriket.rf.gd/rigiketopitux.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_dd36086d65974c9e9a00642b5d42f7f9.pdf?index=trueIn PDF document text
    • http://jatoxat.atwebpages.com/irregular_present_tense_spanish_worksheet.pdfIn PDF document text
    • http://damaxokabipo.epizy.com/gawupavot.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_a40387289b6a43fbb7fb5589fe36396b.pdf?index=trueIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_8491ffe46ec246a895a25d164c77432a.pdf?index=trueIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_3da4ea70336c4ddca24f757341341f9e.pdf?index=trueIn PDF document text
    • http://zerowegujij.onlinewebshop.net/fernando_pessoa_obra_potica.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_off0000cab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB2 5204 bytes
SHA-256: f2e5308bc9e7bb51a68dbd507f9056f7d8c8b123679dd755458a26dfac140ee2
font_01_sfnt_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 9692 bytes
SHA-256: 0873f45cc976234a5796a7f87075a29537c6ef7d2cb0e5e874515a7d66f816c8