Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8e7a3da61c84d8…

MALICIOUS

PDF

70.0 KB Created: 2020-11-22 19:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 802d394ca01121a201fecf088dfcfd52 SHA-1: ddb5748a082baa3d57deb2cf0125aee12c7e6bce SHA-256: db8e7a3da61c84d84c7b29befbf720b809135d2d4a225d4d31f6057ed435e973
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://trafffi.ru/123?utm_term=3+branches+of+government+worksheets+pdf PDF link annotation
    • https://zupuxugemewizo.weebly.com/uploads/1/3/4/3/134309945/dovodivaxufi_xateramexeje.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/xererutelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5faf777806a5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eafd74e8-9478-4bff-b151-e8af054e1d18/horizon_zero_dawn_datapoint_locations.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/bsc_agriculture_1st_semester_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/arpan_songs_pk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad79624-d766-440a-8586-8e7a87954f9c/25342924201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b80fa9-db4d-4d87-adf9-62e05fc35915/bralette_top_diy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a40483ca-2777-48fb-961c-d8adc1ee17c5/dossier_animation_promotion_bac_pro_commerce_exemple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b091e0d3-609d-4ba0-af60-c6ba51f75e38/45148367863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8caa9f47-4169-4515-8ba6-e7d9a6e97ab1/fodajufatet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cbd8cef-3228-4461-862a-cc68f28f6163/suzuha_letter_steins_gate.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/probability_important_formulas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/587289dc-8224-472c-a24d-fd6db918d498/tv_guide_monday_night.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25bac905-3605-4bac-8cd3-59346158f10e/counter_strike_1.6_no_steam_mega_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/53283440605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e35793-c9b4-4263-8c07-33ed34337aa2/falikozuderozeki.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_off0000d1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FF 5964 bytes
SHA-256: d2fcb574727966f66e971942cb863afa2b226ed1e17501bb437f6561659d74d1
font_01_sfnt_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 10572 bytes
SHA-256: c96cd97e9268a8b8764d18e48c7b2dd5590e3e23862c44b47e8682ac781dc975

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