Malicious PDF — malware analysis report

Static analysis result for SHA-256 1190bb49d6c0bd15…

MALICIOUS

PDF

74.6 KB Created: 2021-02-20 04:17:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3a54ac9c7b6274a10d0e25dbc2bb8b32 SHA-1: 5eb629e6cdd6c9396f16b7fc2321bdb4f7373454 SHA-256: 1190bb49d6c0bd15fb0b894542d147ee1f21cd95229104521788cc6884cea79a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=english+conversation+classes+library PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5fd676aa3a05b.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/1YBjfhb/receita_como_fazer_glace_para_bolo_simples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_600f526caaaea.pdfIn PDF document text
    • https://kutobuxuvesoga.weebly.com/uploads/1/3/0/7/130740510/jezowule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494165/normal_5feb34ee01dca.pdfIn PDF document text
    • https://cdn.sqhk.co/giwegulatil/fl0haid/what_you_want_meaning_in_tamil.pdfIn PDF document text
    • http://saluzoz.iblogger.org/accu-_seal_6300_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413978/normal_602225a58a9f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480403/normal_601b4e590bfe4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guzedero.rf.gd/excel_find_duplicates_in_two_different_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/7252266784.pdfIn PDF document text
    • http://mexowotevofo.rf.gd/catabolism_anabolism_worksheet.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_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 5320 bytes
SHA-256: 7e4818e9750c5a1d0d1003c4d583f43a6559c9cc9f475e4cf95f1d490b1370d4
font_01_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 10856 bytes
SHA-256: e5170e0411651a0ff9ce5ff349ce4c3be5bcd00995a14ffbafc899941cdac717

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