Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d50bea6014b60e…

MALICIOUS

PDF

80.8 KB Created: 2021-05-25 17:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a404890e1304e834c2b303e8e2fee56c SHA-1: 2d5826aebde4c20d246158dd496082988fb59d85 SHA-256: 46d50bea6014b60ee06709e60377954fad474073b6bb096f1a10ccb47ec855f4
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 ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=convert+pdf+to+word+download+online+free PDF link annotation
    • https://losepubi.weebly.com/uploads/1/3/4/5/134502138/xepusexanu.pdfIn PDF document text
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/8dbd5e4aa.pdfIn PDF document text
    • https://pomixorum.weebly.com/uploads/1/3/1/6/131606605/zusuxuxejipalibon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470832/normal_60245535a6ffe.pdfIn PDF document text
    • https://nexijapa.weebly.com/uploads/1/3/5/3/135309594/5329197.pdfIn PDF document text
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/baf1c466.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385412/normal_5feb7453d1b55.pdfIn PDF document text
    • https://venefosek.weebly.com/uploads/1/3/1/8/131871910/f1d9bd7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424361/normal_5fd7b1c1d9d11.pdfIn PDF document text
    • https://mugozesomufigor.weebly.com/uploads/1/3/4/6/134608113/daxisevegoba_jodogaxodun.pdfIn PDF document text
    • https://kafowudozajem.weebly.com/uploads/1/3/4/6/134613952/8ff6be695841a8.pdfIn PDF document text
    • https://niromegezos.weebly.com/uploads/1/3/2/6/132681660/9df0ed96d9a89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/190601ac-61fe-44df-8bb8-6f7dbd1979da/2455743679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da99317-d28c-4a4a-901d-c9f78b33bf86/how_to_clean_a_singer_featherweight_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23f33035-7691-40b4-af79-8486aa7426c3/gokovibuzesave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee1d443f-80b6-4542-a78b-59de844bacf5/22674146181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca0d496-a211-492b-9971-bdeb1d8c90c4/start_living_now_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e820af-e5b5-4cda-ad99-e497f01d3f66/total_gym_1700_exercise_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba21483-52e9-4677-914c-921ab5bfccd4/nokej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 4820 bytes
SHA-256: 2717dd77296cb40f17709cd22398a6b3ad7ef37749b266aaf7752ddf93ed7f39
font_01_sfnt_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 11136 bytes
SHA-256: 943fa7836b270819b2ef4fc18303ac7719082afcc1624c0700a5643ff8ef5e69
font_02_sfnt_off000127a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176