Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf4c81ab04eb170…

MALICIOUS

PDF

78.7 KB Created: 2021-03-18 12:06:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 70dce543053da58b0105c87f2f3b8490 SHA-1: 4d52bbe6271ba59e9dc2a5322ab0dc0558684ead SHA-256: 7bf4c81ab04eb17069398e612ed677538a75405bff7167646a6a677700fa0332
126 Risk Score

Malware Insights

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

The sample was detected as a phishing/malicious PDF by multiple engines, including ClamAV and an ML classifier. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

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://maypoin.ru/aws?utm_term=location+5+themes+of+geography+examples PDF link annotation
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/cb88bf9a011b17a.pdfIn PDF document text
    • https://tozadifoxu.weebly.com/uploads/1/3/4/9/134904498/8584108.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/88970478594ucvur.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/royal_botanic_gardens_sydney_map.pdfIn PDF document text
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/2397432.pdfIn PDF document text
    • http://copyrightshelpscenters.com/two_for_the_road_movie_online_freeej57z.pdfIn PDF document text
    • https://didokizobu.weebly.com/uploads/1/3/4/7/134711826/burejemupetetor.pdfIn PDF document text
    • https://nogexumojadug.weebly.com/uploads/1/3/4/2/134235638/1349249.pdfIn PDF document text
    • https://wuxebejodivo.weebly.com/uploads/1/3/6/0/136030931/gebajepinupivo_jokivabanuliga_garapufofolu_solanovimaj.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/60925941226.pdfIn PDF document text
    • https://xukovefekafevut.weebly.com/uploads/1/3/0/9/130969731/e3a5c9.pdfIn PDF document text
    • http://rifijetuvijilam.medianewsonline.com/futuran.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/2c7f3fe6-2aee-4333-972e-9b13d7da1ac2/what_are_the_best_forex_trading_strategies.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_53cdf088daa64a15b37ab25cab7b5ad8.pdf?index=trueIn PDF document text
    • http://mujebik.atwebpages.com/fosulofunededowoweta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02c61ecf-b18e-4743-bfde-4e4ed11c5a48/metodologia_y_tecnicas_de_investigacion_juridica_azua_reyes_sergio.pdfIn PDF document text
    • http://zedowep.atwebpages.com/art_of_teaching.pdfIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_9fdb3bf998744844b3336f0d626440a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a23a2e-307e-4bf9-9cd4-24620378ab68/tamil_novels_free_download.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_off0000f606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 5664 bytes
SHA-256: 7c0aac86a04f7e8c4501bcf7f350728bbc24e9f4b8428ee95917d2ba5ae4eaae
font_01_sfnt_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 10496 bytes
SHA-256: 771016eeb211b0123f5bec774935eccf9f29ceb78520725c9b1f8d081262f376

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