Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48a3e778a08771f…

MALICIOUS

PDF

77.2 KB Created: 2021-04-12 11:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 67ffdf8520011bb9eb93097b996e79b1 SHA-1: 22fefe57b4658e2423fe89c8ecb41273b2ca3a7d SHA-256: d48a3e778a08771f155577cedd5e1d8eda36d2dcf59de3284c4c1c791236e755
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic findings of a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://dugedepap.ru/strik?utm_term=craftsman+100+table+saw+insert PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484356/normal_5fe9d7b085a71.pdfIn PDF document text
    • http://wowitaly.pro/rafugivizozogegizacs8np.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409102/normal_605b6dcfca330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_60513dee6ef3b.pdfIn PDF document text
    • https://nepikazot.weebly.com/uploads/1/3/4/5/134526085/1167592.pdfIn PDF document text
    • http://rarojujelalonu.iblogger.org/25077958395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_606c9d5cf28bc.pdfIn PDF document text
    • http://vkrowl.com/dometic_ac_thermostat_conversion_kitjos8i.pdfIn PDF document text
    • http://fridgeservice.ru/xiwebaliwufopujazuzenxvta9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_6060e9c43f3f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366964/normal_5fcdc052d8ceb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484812/normal_5fdae38aaae90.pdfIn PDF document text
    • http://sdfafq.info/why_does_my_nighthawk_carbon_monoxide_detector_beeping6zwqt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454811/normal_5fc80c2715a62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_606ac2f1bd0ec.pdfIn PDF document text
    • http://sluzhba1.net/requirement_of_ifc_in_audit_reportwi44d.pdfIn PDF document text
    • http://options.expert/laxapidixokycuaq.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/6287324.pdfIn PDF document text
    • http://price-list.moscow/35210511437599me.pdfIn PDF document text
    • https://ruragivelexodi.weebly.com/uploads/1/3/4/6/134663557/464d6c3.pdfIn PDF document text
    • https://sobiwololisa.weebly.com/uploads/1/3/0/9/130969717/balokarolutot.pdfIn PDF document text
    • https://dozogifelezu.weebly.com/uploads/1/3/4/3/134313369/d3837397f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419644/normal_602fbac4ab36f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://budivisatenebo.rf.gd/ropobexesezabeb.pdfIn PDF document text
    • http://kexafaxepel.epizy.com/plural_nouns_worksheets_with_answer_key.pdfIn PDF document text
    • http://ditufadupogeju.epizy.com/c300_coupe_performance.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_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 5244 bytes
SHA-256: fbba637c00ecb0004c871b1e097f712075a8bc96b5f7a59bd01a4ba02df4e9a5
font_01_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 11540 bytes
SHA-256: f9618287d1a1b03d5addef694b648ba254d57ecc971ef3065dafea877ced4f07