Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0cd0bceb5acef9…

MALICIOUS

PDF

70.3 KB Created: 2021-03-24 05:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cf1fa79125821d407f34280858de644e SHA-1: 1e53ccf2d0ce6caf67ad85d38a37997a82e68669 SHA-256: ce0cd0bceb5acef976bf7fe29eafb88be90df135dfaf7fae0f41495df7053be4
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://midufefew.ru/wix?keyword=meiosis+worksheet+multiple+choice+answers PDF link annotation
    • http://katipef.medianewsonline.com/boggle_boards.pdfIn PDF document text
    • http://healthyforczechrepublic.site/heat_and_glo_electric_fireplace_insert45a1l.pdfIn PDF document text
    • http://rozogididibusar.sportsontheweb.net/98656776423.pdfIn PDF document text
    • http://nulivanofika.mygamesonline.org/gogejepi.pdfIn PDF document text
    • https://kanodofeju.weebly.com/uploads/1/3/5/3/135325650/rekog.pdfIn PDF document text
    • http://interbankdigital.com/brother_hl_2140_error_drumz7vtb.pdfIn PDF document text
    • http://jufanurozud.getenjoyment.net/vocational_medical_english.pdfIn PDF document text
    • http://claire-irk.ru/macbeth_act_2_scene_3_modern_english1h409.pdfIn PDF document text
    • https://dojunulopifo.weebly.com/uploads/1/3/4/4/134445836/misuri_birodaratofe.pdfIn PDF document text
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/3601591.pdfIn PDF document text
    • https://libodarupebixab.weebly.com/uploads/1/3/0/9/130969674/fbc024f07b71.pdfIn PDF document text
    • http://zudezipebij.22web.org/systemic_anatomy.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/33821163462.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/simujix/ultrasound_guided_barbotage_calcific_tendonitis.pdfIn PDF document text
    • http://dalufiba.rf.gd/71404262841.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/56052441510.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/datefi.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/tukowegowuvaxum.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/apocryphal_books_of_the_bible.pdfIn PDF document text
    • http://savopabefiw.epizy.com/98226084101.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/76619905374.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/sample_nurse_leader_interview_questions_and_answers.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_off0000d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 5336 bytes
SHA-256: 53a6dd178a8bf8b0b15953ce6c45a1209c3c82ea639e2eaaa3957d84f4d6acf2
font_01_sfnt_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 10240 bytes
SHA-256: 00529c9ba0d3a48cf4947ab54fb0662276b271e6a8a3c023577105be71e9b6f9

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