Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d40bcf69c5c76fc…

MALICIOUS

PDF

85.9 KB Created: 2021-03-15 03:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 050ebaa0514ef231292f0d64d633aace SHA-1: 656977b31156a40648cb6cc36873a12fb07bc23c SHA-256: 2d40bcf69c5c76fcf9faeab0a4d53c1a82aafc7990daeff919cc50bc22a9e476
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The document body's text, 'Spoken english book pdf in gujarati free download', is a lure to attract users to click on these links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://zajinet.ru/award?keyword=spoken+english+book+pdf+in+gujarati+free+download PDF link annotation
    • http://fepaporipevari.mypressonline.com/51925681021.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/sosirunesoloz.pdfIn PDF document text
    • https://konozobit.weebly.com/uploads/1/3/4/4/134456152/jozokukugonazogosav.pdfIn PDF document text
    • https://kasutuwisuruja.weebly.com/uploads/1/3/1/8/131872017/591435f5618f941.pdfIn PDF document text
    • http://maxoranano.sportsontheweb.net/autismo_na_escola_livro.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/abn_form_for_medicare.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/jafujumasetanupanir.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/liwubukar.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/cursos_de_idiomas_online_gratis_con_certificado_2020.pdfIn PDF document text
    • http://vavexefane.mypressonline.com/48793145014.pdfIn PDF document text
    • http://didazema.mypressonline.com/neoliberal_institutionalism_keohane.pdfIn PDF document text
    • http://pawusewi.sportsontheweb.net/rugoli.pdfIn PDF document text
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/luzuz.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/nawuvud/benadizogetoxiwosex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c458741d-acc5-4e5b-9e43-669cbf1da730/boruzivuzefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2d1479f-96bd-4ee3-a87a-9a8d9364a181/an_indigenous_peoples_history_of_the_us_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22e7f30c-cc71-42d3-8621-6a7a7670a4a8/50462035836.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/molaseton.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/terapia_cognitivo-conductual_para_tratar_la_ansiedad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd27ff4d-b609-4c14-8de3-e63f96a249f4/sulejibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/812356d3-4d8a-4542-b0c7-c9bbd9fb7019/cant_stop_falling_in_love_kalimba_tabs.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_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 5776 bytes
SHA-256: 7cc92d7117e622da9a89f70edab2ca254cb5a9e81724d90e0c337f95ef556cd4
font_01_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 10636 bytes
SHA-256: 60d8f6e95cc705e9bc2d0f84fde7889e21c909691ab012dcf9c59f7afad911e2