Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fba0fc34afe8386…

MALICIOUS

PDF

75.6 KB Created: 2021-03-17 01:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8f3271105a5a04eb20da167b4001f445 SHA-1: 1fc37eb5693b119e94d4412f99a17b86ecaa70e8 SHA-256: 4fba0fc34afe83861fe5f5010bd597244e2c1f5db8b8bef76d7dbe292709f0e7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on suspicious domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jumiwimov.ru/strik?utm_term=the+great+gilly+hopkins+book+pdf PDF link annotation
    • http://fiwazurenorin.iblogger.org/65186883405.pdfIn PDF document text
    • https://cdn.sqhk.co/sowuwinadapu/5durigU/average_premium_gas_price_in_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/bCgphj1/2nd_grade_thanksgiving_reading_comprehension_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_602331dc01791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_6032e0644b63f.pdfIn PDF document text
    • http://cashbackmoney.info/criminology_the_core_free9x9nx.pdfIn PDF document text
    • http://opensalle.xyz/how_to_call_dish_tvw8vpo.pdfIn PDF document text
    • http://sudebatuwilazet.iblogger.org/wezubeketoborapumexetodu.pdfIn PDF document text
    • http://iglivesupportteam.com/how_to_repair_furnace_heat_exchangermb1si.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458824/normal_5ff8844684e67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/59263433732.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/mp_chart_library_android.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/answering_the_phone_in_german.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/joana_speed_leveling_guide_free.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_f390125a3dc549b3b3ce34d12e3f4897.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/75769849026.pdfIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_665d84b1b0614849a3ef3b554813ae73.pdf?index=trueIn 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_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 5560 bytes
SHA-256: 53c15eb6c36ceffd2144c150311ca06a3bf99b5df9dfa98729aecd491bee359e
font_01_sfnt_off0000fafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFA 11836 bytes
SHA-256: 54f5c897d34a76b1c3cdd3e5a73a0c308413cb1d043d6c74ee893b3701b1351d

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