Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98555c1a35c7cfd…

MALICIOUS

PDF

79.1 KB Created: 2021-02-06 08:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 87ea729d7bcef1441892198b1c852378 SHA-1: 756605f107a89214a2a2fae398f2bfd58eb3dcb7 SHA-256: d98555c1a35c7cfdf1b1aa4a15125ab400cd0fd58dc0f72a1cfacaf12cc894cf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a large link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is intended to redirect users to potentially harmful websites.

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://maypoin.ru/aws?utm_term=2016+chevrolet+spark+owner%2527+s+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467571/normal_6000084edb844.pdfIn PDF document text
    • http://uaregroup.com/pop_ceiling_design_catalogue_2019gfseb.pdfIn PDF document text
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/9841627.pdfIn PDF document text
    • https://zogoporev.weebly.com/uploads/1/3/1/3/131381602/1946261.pdfIn PDF document text
    • http://shop-kid-toys.online/kijudixemajiteleme7qh0n.pdfIn PDF document text
    • http://agentsecure.space/ielts_5_practice_test_academic_set_1_answerswnp6s.pdfIn PDF document text
    • https://wajuzetixageg.weebly.com/uploads/1/3/0/9/130969085/1cae9eadde87fcd.pdfIn PDF document text
    • http://strita.space/securitas_direct_verisure_manualzu1gr.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/podawakumepewez/gawapudupaxeximivugo.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/bach_fugue.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/zawomitine.pdfIn PDF document text
    • http://lipesomidu.epizy.com/chhota_bheem_cartoon_full_video.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/answer_to_today_s_jumble_words.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/ielts_4_reading_test_3_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/66193649726.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/gotiwusez.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/gawain_4_window_shopping_ap10_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/lagu_hanya_rindu_andmesh_kamaleng_cover.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_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 5808 bytes
SHA-256: ef318dcc8b7decf1205bfd4056099e0058dae54c6efa76cc6000aefcc90b8d8f
font_01_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 12580 bytes
SHA-256: 18d58ca1a315cbcdf574d662923cc1aa3b9f6983d814dc4d628f091161534eb0

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