Malicious PDF — malware analysis report

Static analysis result for SHA-256 2126811916b2dab2…

MALICIOUS

PDF

71.8 KB Created: 2021-03-01 22:21:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: dd7f4acae226cda5fb8565a7856d5c10 SHA-1: fddc43c0eaba17f69f6fc028662a8b6f008478cf SHA-256: 2126811916b2dab257b7012b033508f0e53aebb3400815cb8d0616da65dfbc92
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs, such as 'https://maypoin.ru/strik?utm_term=how+to+install+ink+in+hp+printer+2540', are used to lure victims under the guise of helpful information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://maypoin.ru/strik?utm_term=how+to+install+ink+in+hp+printer+2540 PDF link annotation
    • http://hookup153.space/channel_is_newsmax_on_directvfqfdq.pdfIn PDF document text
    • https://cdn.sqhk.co/wetewajaba/FifgeEW/sexexafajexisezu.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/MjfUgdX/neutron_music_player_apk_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/idwihgc/any_mobile_number_call_details_online_without_otp.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/ihFKhhj/solucion_high_school_escape_level_8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_6011c379e0b50.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/nidifih/arknights_w_banner.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394071/normal_5fe1859cb10df.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuzini/5j8whhn/vujigonumokanosonebo.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/sarisim.pdfIn PDF document text
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/986319b11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404103/normal_5ff496a9c8600.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468812/normal_5ffcaae7da885.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/i6jhieh/my_ufone_app_free_mbs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414696/normal_6023d5d0b6e04.pdfIn PDF document text
    • http://8gusevshop.website/32046955890457er.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/iAhd8qT/xidizet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/factoring_binomials_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/fibibaf.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_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 5512 bytes
SHA-256: 03033e1a83499ac7a442767e5ba0e6a4575afd09bf00573906209b7e3f6f85b9
font_01_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 10136 bytes
SHA-256: d8b6fd8f2c373e829758fa55bff1c833a2ea302dec0c135f6433935213544cfd

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