Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75136a08ea2ef89…

MALICIOUS

PDF

85.6 KB Created: 2021-03-22 12:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2fce9baf15ae7b57f935833854603139 SHA-1: 2bc168077fa860d4935223ce68c01cdba9b5c9ae SHA-256: c75136a08ea2ef89ee02cbbff55fda7734964af0a38a6bcd3ef2ea67974d62bd
186 Risk Score

Malware Insights

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

The PDF document 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 document body, though heavily obfuscated, contains text related to 'proving triangles congruent worksheet', which is likely a lure to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lozipotod.ru/strik?utm_term=proving+triangles+congruent+worksheet+and+answers PDF link annotation
    • https://vavuwujaxozu.weebly.com/uploads/1/3/1/0/131070334/662095.pdfIn PDF document text
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/b6fbba6c2bb34.pdfIn PDF document text
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/0656c.pdfIn PDF document text
    • https://nusatugob.weebly.com/uploads/1/3/4/8/134865614/romelirojobavi.pdfIn PDF document text
    • http://kegumexiwekot.22web.org/valid_email_address_format_gmail.pdfIn PDF document text
    • http://puveputado.sportsontheweb.net/vufitidaguvesub.pdfIn PDF document text
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/vebudaxu-razafilikig-netevo-fanix.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/basuforoxopezed.pdfIn PDF document text
    • https://tezilejesitox.weebly.com/uploads/1/3/1/1/131163634/8011173.pdfIn PDF document text
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/5128945.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/95870221777.pdfIn PDF document text
    • http://romabeveseruzor.22web.org/gartner_report_on_cloud_security.pdfIn PDF document text
    • http://gajaxujifusokul.mygamesonline.org/89533083762.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/kavalukato/xajuwupusazal.pdfIn PDF document text
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_0ad7505a64ed4a74bf3628e5172be9f7.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_9b2e8d42b071415fbc11b5e9786adcc5.pdf?index=trueIn PDF document text
    • http://fojosotum.myartsonline.com/topology_and_its_applications.pdfIn PDF document text
    • http://noroved.myartsonline.com/react_js_tutorial_download.pdfIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_b0b3c6426fa342c7ad083174ad00689c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulozor/free_website_design_templates_html.pdfIn PDF document text
    • http://bazogito.epizy.com/power_of_attorney_act_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/fopuw.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/16113038322.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 5416 bytes
SHA-256: 52b3c6b3e3920af23e0a41ea5433a6dcd20b234c2315735aa7bd5513a89d98a0
font_01_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 12168 bytes
SHA-256: 31e042a41d3cae620ac281be067998a9d341c523ef04ade7af3588d16c934855
font_02_sfnt_off0001324d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324D 16360 bytes
SHA-256: cdbecf7cd37b2e4c52f8b7fb9670043b9034742594b4ce01521ac631787bc839