Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f06a111771082fe…

MALICIOUS

PDF

75.8 KB Created: 2021-03-17 06:06:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fc77e073588757032dda44f5ffdd35b5 SHA-1: 8ef6325045c308d5d4318e47dc905c5937f97482 SHA-256: 6f06a111771082fee781be122873e270a0fded34c6f4dc47b90d9ea532301c11
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 hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=presentations+that+matter+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391896/normal_6027a746f17c0.pdfIn PDF document text
    • http://lukiduxipapep.mywebcommunity.org/31897565561.pdfIn PDF document text
    • https://janusizexagelu.weebly.com/uploads/1/3/5/3/135337128/5c119c5f9f.pdfIn PDF document text
    • http://debagigitefofo.iblogger.org/limimaberilitepil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_600cfaf08c186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_604aca89cb652.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/5b74a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472763/normal_5fd32eee5fad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481170/normal_6021f7e0e749a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_601f89f1f2182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_6009b36cb8be8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485718/normal_5fe6fae66473c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462035/normal_600fda0506ad9.pdfIn PDF document text
    • http://gupirigugorixuf.sportsontheweb.net/wifozetubojosepevetuvorud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385636/normal_5fcedd5d24239.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fijumusuxolegoj.atwebpages.com/norse_mythology_family_tree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c64acd5-4f84-4c3b-88c5-b1774126056c/who_is_the_most_powerful_couple_in_south_korea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee479e95-36e1-4b99-acec-5aa00d5bece5/11374628924.pdfIn PDF document text
    • http://gusagokasu.epizy.com/how_to_take_apart_a_motorguide_trolling_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e914c8e-d4ad-420d-9bf2-9db26cc33f77/how_much_time_it_takes_to_learn_intraday_trading.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/pirutanoratufinupop.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_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 5252 bytes
SHA-256: 7bfa36e3e9bc9d1220c407b194cfced7e6a8c20d2276fbf3fac99c8c38432882
font_01_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 11784 bytes
SHA-256: 5e46fdbf6b33901e71668b35c56374bc328011593a164671fdcd837fe77954c2