Malicious PDF — malware analysis report

Static analysis result for SHA-256 233c02eb4cad0ecb…

MALICIOUS

PDF

75.5 KB Created: 2021-03-15 23:10:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b04e8ee0fb6bd79ee65084b256cb5824 SHA-1: 4499aa3d5453063ab93430508ff5283b9c941b86 SHA-256: 233c02eb4cad0ecb265fc7c6d7339900a57b210d826afbf3f98c366701ad8f16
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a critical heuristic identifying a PDF link farm, suggesting an attempt to distribute or redirect to other malicious content. The embedded URL 'https://seumenha.ru/123?utm_term=laminate+countertop+sheets+reviews' and the link farm URL 'https://robivobaxo.weebly.com/uploads/1/3/0/8/130873737/zunovi.pdf' are identified as key indicators. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to lead users to malicious sites, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/123?utm_term=laminate+countertop+sheets+reviews PDF link annotation
    • https://robivobaxo.weebly.com/uploads/1/3/0/8/130873737/zunovi.pdfIn PDF document text
    • https://nugiwilog.weebly.com/uploads/1/3/1/3/131384260/9cf9bc5a152.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/757228.pdfIn PDF document text
    • http://ditoterelutas.sportsontheweb.net/technical_writing_process_and_product_free_download.pdfIn PDF document text
    • https://manabaxijex.weebly.com/uploads/1/3/4/6/134626004/dovesa.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/naguwilijupaluka.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/jevelel/obteno_dos_alcoois.pdfIn PDF document text
    • http://vujapaporetakik.epizy.com/7610903998.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/animasi_template_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/how_to_make_a_rangers_apprentice_cloak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec01681c-e031-4bd4-81b0-5adeb4c3ecda/22701136052.pdfIn PDF document text
    • http://teboseru.rf.gd/17221149812.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/datilujatolazawan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297f0d4a-e92f-4f72-b34c-755696824983/94327245412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d40f71-2457-41f4-8d9f-d6ed46d6e0b4/pulavezasipukubenujet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4849caa0-6459-4659-bdb8-a95f52ba64dc/what_is_a_smart_goal_example.pdfIn PDF document text
    • http://vutagefen.epizy.com/brantley_gilbert_fire_brimstone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea2f8cf-3de6-48e2-b807-93c2bbf27e62/how_to_find_out_if_my_car_seat_is_expired.pdfIn PDF document text
    • http://vezoxonu.epizy.com/nexanerile.pdfIn PDF document text
    • http://xediguvodolej.epizy.com/cesarean_section_dictation_template.pdfIn PDF document text
    • http://panexorumilogim.myartsonline.com/37034212894.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/forabuleferixabigunub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c641c0-0592-4f50-a65b-80f8735c3d87/13229878289.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_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 5232 bytes
SHA-256: eed14b5fa3e74b05e7b7a14dfc2829dd1d2d7b63a790b6c351cbf3f727e878bb
font_01_sfnt_off0000fa64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 11412 bytes
SHA-256: 189f644c39421688605d762a7d88379c0c5a72b25ecb4a1c9d2812c84261e034

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