Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b06ecaead46b92…

MALICIOUS

PDF

70.4 KB Created: 2021-03-20 22:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 62feceb4aaa5a953f90cd1982004ddbe SHA-1: e60ce4ad0db8223b0991f4904aaf3a334e82ff70 SHA-256: 40b06ecaead46b9204e21635a3a295188ff1becc48c3d5ade92779fbbfd7bce4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a large 'PDF SEO link farm'. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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/wix?keyword=gcf+worksheet+algebra+1 PDF link annotation
    • http://duxinivodozular.mywebcommunity.org/bonney_forge_fittings_catalog.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/a_dolls_house_quotes_about_gender_roles.pdfIn PDF document text
    • http://new-leggins.site/how_to_export_keynote_into_powerpoint0pz2x.pdfIn PDF document text
    • http://interbank.link/worksheetworks_diamond_math_problems_answer_keyblxj4.pdfIn PDF document text
    • https://dukuvewag.weebly.com/uploads/1/3/4/0/134041028/da7cc0500815.pdfIn PDF document text
    • https://tovijivesigaz.weebly.com/uploads/1/3/5/3/135327805/sixadopekizir.pdfIn PDF document text
    • http://nafepuzemobir.sportsontheweb.net/45086971509.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/what_are_the_missing_numbers_in_the_sequence_4.pdfIn PDF document text
    • https://vebuxevofarina.weebly.com/uploads/1/3/4/0/134013543/demavixuxulepof-naxokuzax-gizirozejixak.pdfIn PDF document text
    • http://zuvalasit.mypressonline.com/rawexotusilu.pdfIn PDF document text
    • https://lovevupadu.weebly.com/uploads/1/3/5/3/135328586/14b0a76.pdfIn PDF document text
    • http://rujewazaxijaza.sportsontheweb.net/conjuntivitis_bacteriana.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/guia_ceneval_administracion.pdfIn PDF document text
    • http://puvinizozibejir.mygamesonline.org/38967631655.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/rurovikejigibu/76619187884.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/maxedesalewoxedanoxibofil.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/biztalk_server_2016_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/android_ndk_location_visual_studio_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/fukamigedosevusetewufupew.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/83235964899.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/voguperuzewurumigajukigub.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/baaghi_2_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/who_was_cains_wife_in_the_bible_and_where_did_she_come_from.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_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 5524 bytes
SHA-256: 730eb1ad332c442f626585f2945402a2877361a0a9188da33abb36e1469d855d
font_01_sfnt_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 10708 bytes
SHA-256: 4aa544ddcf17fa8a7fbedc36e27209dc5e697dce59c702a4d3a71aa38b8aa431

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