Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed62c35228c14093…

MALICIOUS

PDF

81.4 KB Created: 2021-03-13 16:13:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0ee7a24964cc336ce8105b7b021f6777 SHA-1: 223aa15e8b2c56bc97ed97561faf1a010d69375f SHA-256: ed62c35228c1409317d0175c6f4c26d297cb847154491b75863576e712c4d482
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate this behavior. ClamAV detection and ML classification further confirm its malicious nature, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/123?utm_term=birth+chart+free+report PDF link annotation
    • https://bejuzozomixur.weebly.com/uploads/1/3/5/9/135966319/a87a6a96e0a0.pdfIn PDF document text
    • http://retys.fun/977260986477k0z8.pdfIn PDF document text
    • http://antonioit.space/6_reading_comprehension_strategiesu0deq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372983/normal_5ffa5bd070150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_602f8782591ad.pdfIn PDF document text
    • http://newyearshop.site/zisen0to9u.pdfIn PDF document text
    • http://lusizekemuva.22web.org/how_to_not_be_average_looking.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505771/normal_60061d4aec9cf.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/2b737c8b4.pdfIn PDF document text
    • https://pukakanasosakum.weebly.com/uploads/1/3/5/3/135392678/1d2a2c71fe35477.pdfIn PDF document text
    • http://eeeeeyyy.space/sullair_185_kubota_parts_manualvvlst.pdfIn PDF document text
    • https://kusafowagu.weebly.com/uploads/1/3/1/8/131871480/4148413.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuzariliwit.rf.gd/rexuso.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_d13425fa3a064827b4a5b1ba1df4e394.pdf?index=trueIn PDF document text
    • http://vejabimumen.epizy.com/atomic_structure_isotopes_and_ions_worksheet_answers.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_2a322881f56c44b7b73e7032103f548b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7ef13e-1b55-4d3e-bf91-5e75942597c8/57802192685.pdfIn PDF document text
    • http://mimedixaresev.epizy.com/rabaripewinikufif.pdfIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_684dd0b698a74626a00bd9fbbf9434ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f404d961-78a0-48d1-a957-8938f951d297/dusuwewolebugipopibupale.pdfIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_7656bcb4a8b54bec91c4a03287ffb09b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c6c262-c4c1-4fa1-8535-f23fa590f0b7/37_brilliant_questions_to_ask_at_the_end_of_every_job_interview.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_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 4944 bytes
SHA-256: 081bf9d8cea62314602a59d77d83cdc65fb52480776db9eddc4dee83a457c177
font_01_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 10492 bytes
SHA-256: 58ebdb5c1eed90b8a010cf5bd30fb8ebf2a86fa9ffe5063fd779190bb208c0fc