Malicious PDF — malware analysis report

Static analysis result for SHA-256 701c8320e3a84692…

MALICIOUS

PDF

75.5 KB Created: 2021-02-18 15:56:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a40232c076443544eff67a02df79c12d SHA-1: 01c5ad275fe13f21ba47a349385cf83d6505972e SHA-256: 701c8320e3a84692fe3fecf43c2c359805cb2ce5b45a219d3bc2eb4bf230cf56
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many of which are to benign-looking PDF files, but one primary URL, 'https://maypoin.ru/strik?utm_term=is+narnia+4+coming+out', is suspicious and likely leads to a malicious site. The document body content is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these links.

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://maypoin.ru/strik?utm_term=is+narnia+4+coming+out PDF link annotation
    • http://pixubak.iblogger.org/google_sheets_conditional_formatting_whole_row.pdfIn PDF document text
    • http://fefosawixamuwow.22web.org/21275173009.pdfIn PDF document text
    • https://paxepufa.weebly.com/uploads/1/3/4/6/134640660/kodesakojajujojabuva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460950/normal_600897b5c59f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501028/normal_60261efc68527.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/assignment_of_franchise_agreement_form.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/takateg/the_face_shop_sheet_mask_for_acne.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/kojuxitaw.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/57808983222.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/crystal_report_using_dataset_in_c._net.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/clothes_exercises_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/search_on_ipad_safari.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/causativa_en_ingles_ejercicios_resueltos.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_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 5112 bytes
SHA-256: 8b77bbce29fc6c69b88d5590c0bef2408f5312b8ae1e30762aba40a998577ccd
font_01_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 11236 bytes
SHA-256: 02dac96a885c024a35cd06dba329de25f6ddb6dec923116ccc9f1399e6fc968f

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