Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7316add870d1f4…

MALICIOUS

PDF

78.7 KB Created: 2021-03-22 02:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c7cb5a279e941826e854177a238e067f SHA-1: 07951e34d47465b0e379e66e4159f30f70d04569 SHA-256: be7316add870d1f446a221a56a8be84d4b56b2a43207cc2c9116b7a8dcd1a5d5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://seumenha.ru/strik?utm_term=how+to+find+the+volume+of+cylinders+and+cones', are likely used to redirect users to malicious sites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/strik?utm_term=how+to+find+the+volume+of+cylinders+and+cones PDF link annotation
    • https://cdn.sqhk.co/bebumula/ghYInSJ/rexaxonimuxexodozobi.pdfIn PDF document text
    • https://wigowaziralo.weebly.com/uploads/1/3/4/4/134498628/4872778.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/fgdiaKm/dekuxisevonifufeg.pdfIn PDF document text
    • https://namowabe.weebly.com/uploads/1/3/4/0/134000139/1b5f5.pdfIn PDF document text
    • https://jelezasi.weebly.com/uploads/1/3/5/3/135347821/kuwoxidomaki.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/Rhcv5XZ/kukejagabugudesadoxaves.pdfIn PDF document text
    • https://cdn.sqhk.co/tedatekalo/906fiIS/beats_headphones_operating_instructions.pdfIn PDF document text
    • https://dilemawusufugo.weebly.com/uploads/1/3/0/8/130874642/valuwulod.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/jhiiaij/era_sosial_dan_budaya_di_indonesia_merupakan.pdfIn PDF document text
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/xawew-rozegewim.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/hjjange/skyward_family_access_bisd303.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/hiulggD/jvdroid_ide_for_java_download.pdfIn PDF document text
    • https://vituxusupodewe.weebly.com/uploads/1/3/1/3/131379836/wavibepuvuzal-xejemosixi-vitepi.pdfIn PDF document text
    • https://kodalogodo.weebly.com/uploads/1/3/4/7/134753778/3bb0e.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/chhRjeb/how_to_follow_your_facebook_friends_on_twitter.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/dgjtx50/wink_martindale_age.pdfIn PDF document text
    • https://rosififobagas.weebly.com/uploads/1/3/1/1/131164218/wesugokezimesikotiwa.pdfIn PDF document text
    • https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/8469621.pdfIn PDF document text
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/gotolefanofukaxeguf.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/aLj8Axb/cartoon_channel_list_airtel_dth.pdfIn PDF document text
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/ead2c3eb6bdf0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_33c05a6a9190476e84ba10c54682ea75.pdf?index=trueIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_79bbb95b55624e459896b170871bf17b.pdf?index=trueIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_a633789107064032b63b8ee983ae5d07.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_2eab34d7f6ba4d1898d05bcee2573b11.pdf?index=trueIn 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_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 5476 bytes
SHA-256: c7ed99e5eaf9b6f42f6c7c3c3913c0cab6021b6590302d340e6e8b5ab57d4e8e
font_01_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 10164 bytes
SHA-256: 719b00fbcd76bbb8cedf621aa62c7dc6008a3cf31f38fce4afb969af038f95f5

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