Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fb09300973ad8c…

MALICIOUS

PDF

84.1 KB Created: 2021-04-09 07:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b7d5ea1d96a9494285fdda0025246181 SHA-1: 2b9f713816ee7e6f4975fafc727c54fad157f0f8 SHA-256: c1fb09300973ad8ce8e7960eb55bf14f428b84eb9e68a417b42af39385862e2b
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to suspicious domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the embedded URLs and PDF structure point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://baarspo.ru/strik?utm_term=what+are+the+6+areas+of+cognitive+psychology PDF link annotation
    • http://managerprogram.live/no_continente_europeu_uma_linha_frreaqhx6c.pdfIn PDF document text
    • http://jupifidupepir.getenjoyment.net/cattle_breeds_an_encyclopedia.pdfIn PDF document text
    • http://matteset-spon.space/who_was_cains_wife_in_the_biblet411m.pdfIn PDF document text
    • http://hairsprof.ru/55650781355fj384.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376099/normal_5fde79e5d064b.pdfIn PDF document text
    • http://kunozoxutokusu.mygamesonline.org/what_does_calorie_mean_in_biology.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/patch_notes_sims_4_november_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tetolonul/CThehf0/go_chicken_go_7th_st.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_604271bd6f55b.pdfIn PDF document text
    • http://parkji5x.xyz/bloomberg_terminal_excel_guideeendy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_5fdc11081607d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449417/normal_5fea0869a9ac7.pdfIn PDF document text
    • http://ratixopawem.mypressonline.com/barrier_free_environment_in_schools.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_60419f80e97ad.pdfIn PDF document text
    • http://richteam.site/tuboboxiwolanepobx40uj.pdfIn PDF document text
    • http://wezenilokiwuv.iblogger.org/how_many_canto_in_inferno.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/jbieZif/viridian_city_gym_map.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugifer.onlinewebshop.net/belisarius_cawl_the_great_work.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_9c31975b4a9044cc8731628e5585bd4c.pdf?index=trueIn PDF document text
    • http://jigobejebameg.epizy.com/how_do_currency_exchange_work.pdfIn PDF document text
    • http://pitidurafekuji.rf.gd/cuanto_cuesta_el_metro_en_londres.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_c9779d8e01014dcb93f4013d2db36f5b.pdf?index=trueIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_8fdc91f4aacd4e52b56b37a38898e81e.pdf?index=trueIn PDF document text
    • http://pubamawuxa.epizy.com/little_caesars_pizza.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_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 5608 bytes
SHA-256: bdb583e8a39fa976fe7cd123eee3fb27cf2a3ca186d942b00fd616b016a2ec94
font_01_sfnt_off00011c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C86 11292 bytes
SHA-256: 6e73a560eca65c355abdab3ac9a3b81298f5b81587590fbd1e2a9f92b52ed8c4