Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc36138a1edb2c4…

MALICIOUS

PDF

78.2 KB Created: 2021-04-18 04:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a58d39bfaa92ba2219ae9c75d26d03ad SHA-1: de21cb0ee470642e535fe369b84ed2a7980abe7e SHA-256: 1cc36138a1edb2c4cb3cd205b52e039bf906a480c94147353fb754a1e8cf65d9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a prominent one leading to 'jottigo.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, further supporting malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=autocad+drawing+view+online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446280/normal_5fcab896b70b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501632/normal_5fdfd4d973e72.pdfIn PDF document text
    • https://zupelewelasilag.weebly.com/uploads/1/3/4/5/134594614/gefunoperewu.pdfIn PDF document text
    • https://cdn.sqhk.co/gasowifozil/Amq1qge/10622702589.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/1ihhehj/ipay_brta_bangladesh.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/2eY2Vjd/quran_in_english_with_meaning.pdfIn PDF document text
    • https://fubexomufepa.weebly.com/uploads/1/3/4/8/134850999/wefewagapamux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411219/normal_5ffa808fd3f67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_600d8d53570df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476270/normal_6002a69549bed.pdfIn PDF document text
    • http://goworudubilit.iblogger.org/celine_dion_i_m_alive_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_602ec5234280e.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/zafiwuxuliw-wokemiler-kawaka-rupodaw.pdfIn PDF document text
    • http://bonifacy.site/iwb_holster_for_ruger_lc9s_with_crimson_trace_laserwvir1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499351/normal_605fb2895d0a7.pdfIn PDF document text
    • http://meetly.space/wenelixazun790vs.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/fifihif/toy_story_smash_it_apk_mod.pdfIn PDF document text
    • https://vugosolisaxude.weebly.com/uploads/1/3/2/8/132814967/1b8a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384634/normal_603a6a06624b2.pdfIn PDF document text
    • http://bostpolamos.site/podazatipovzdsp.pdfIn PDF document text
    • http://salearea.pro/coleo_primeiros_passos_editora_brasilienseu1egm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388283/normal_605a3ec6c175e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuwawolaninezon.epizy.com/paxaf.pdfIn PDF document text
    • http://tasopawak.rf.gd/72523535306.pdfIn PDF document text
    • http://sikejilewiz.epizy.com/azure_rights_management_premium.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_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 5072 bytes
SHA-256: 2beb0daf7e1da015b68477fb659f8e5942bdcf494d94f8c79ce5d2331fab0553
font_01_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 10784 bytes
SHA-256: 1f5b36db7470b126f33bcf4b24451aaf9f20a071a1cf0111dff7fe17d8203a75

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