Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7782b44eaf3bc44…

MALICIOUS

PDF

86.5 KB Created: 2021-03-20 12:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b1010a9d99cff139c279b4679ac8f0da SHA-1: 3df661289c488a8ab656798c037cf3cb5bdc7d99 SHA-256: d7782b44eaf3bc440b137aa44f3cff6dedc81fa1bbd560b0a102866e53aa4a2e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware delivery attempt. While no scripts were explicitly extracted, the PDF structure and associated URLs strongly indicate it's part of a phishing campaign aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/123?utm_term=b.+ed+additional+form+2018+du PDF link annotation
    • http://huseyincanx.com/zediwukipez4lrjz.pdfIn PDF document text
    • https://wufomuwu.weebly.com/uploads/1/3/0/9/130969972/gaxamojutimezupur.pdfIn PDF document text
    • http://lupelev.22web.org/fosekuzuj.pdfIn PDF document text
    • http://telgrm.site/31642328615a39cq.pdfIn PDF document text
    • http://videohost.space/900811912408xbd9.pdfIn PDF document text
    • http://itanah.space/vexilar_flx_12_reviewihur1.pdfIn PDF document text
    • https://vekatofe.weebly.com/uploads/1/3/0/7/130775682/584ed5e8a.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/army_apft_score_chart_female.pdfIn PDF document text
    • http://wabaxifejem.sportsontheweb.net/rojagutomisotosawavu.pdfIn PDF document text
    • http://wotedogupowu.sportsontheweb.net/57498532157.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/how_to_light_rheem_tankless_water_heater.pdfIn PDF document text
    • http://tapavinologo.mygamesonline.org/71135180496.pdfIn PDF document text
    • https://koxofekidoponu.weebly.com/uploads/1/3/3/9/133997415/9906376.pdfIn PDF document text
    • http://puwobero.22web.org/belastingdienst_aangifteprogramma_2012_en.pdfIn PDF document text
    • http://beremoter.online/2020_football_recruiting_rankings_rivalsuyujt.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/alcoholism_articles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nexuvojof.epizy.com/newomegatewaro.pdfIn PDF document text
    • http://fazovalekotevo.onlinewebshop.net/segiwewedibererotijetofe.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/pebexesurikoziwawema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e13ca35-f6cb-41a0-bc53-65d0a646925e/92593690692.pdfIn PDF document text
    • http://tavamikilav.myartsonline.com/can_you_air_fry_potatoes_without_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d3588e-b7a4-4f3c-ab30-bac47f773506/44380756338.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_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 5476 bytes
SHA-256: 10db91dd6f1655efdd7f25930540731a1ed071345fd7882d2e9e4586ccb2d8c4
font_01_sfnt_off000125ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CA 11516 bytes
SHA-256: ec0ab50f0a0c9d9f93df09a9f5c7186115989fb3b5945e9416590dfb9496714e

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