Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a35e01ec506c349…

MALICIOUS

PDF

80.8 KB Created: 2021-05-01 00:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 296ed7bdf01dad918863d763e8788781 SHA-1: cfdf9426d4303f22669932a06fd893b98b76d08d SHA-256: 5a35e01ec506c3498b937ea370b84d4a05e4c11e312fd45bc792694bcfe9efc3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary malicious URL identified as 'https://baarspo.ru/strik?utm_term=book+of+dragons+5e+pdf'. This URL, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file, indicating it's likely a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 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://baarspo.ru/strik?utm_term=book+of+dragons+5e+pdf PDF link annotation
    • http://lifolibi.sportsontheweb.net/50267411548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_605647544b731.pdfIn PDF document text
    • https://kowijifeno.weebly.com/uploads/1/3/5/3/135390944/pujabeximudex.pdfIn PDF document text
    • https://galevegu.weebly.com/uploads/1/3/4/5/134507196/namaf.pdfIn PDF document text
    • http://timinome.getenjoyment.net/gurinanewumurazageze.pdfIn PDF document text
    • https://kasezikibojeg.weebly.com/uploads/1/3/1/8/131871727/b81faa7d614dc4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477615/normal_602a707d7c004.pdfIn PDF document text
    • http://wogaxuma.22web.org/bible_training_center_for_pastors_dennis_mock.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468820/normal_604b0fbb8ea26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480582/normal_60136a09e708a.pdfIn PDF document text
    • http://guzexesuge.mypressonline.com/everstar_air_conditioner_parts.pdfIn PDF document text
    • https://nozinogut.weebly.com/uploads/1/3/1/1/131164424/4178784.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/1a51fa.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/padma_shri_award_2020_download.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/05735c67-16d0-442d-845c-daaf1510a716/68597356812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e521ae-00dc-4c68-9a73-5d9a2248be58/90018749245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc205bc-6cfc-4445-9ed5-8a2807bb1d72/which_vegetables_are_good_for_what.pdfIn PDF document text
    • http://nujugeteteda.myartsonline.com/wozegim.pdfIn PDF document text
    • http://kanobar.epizy.com/12th_centum_scored_answer_papers_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/nusilasomazuki.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/64368976676.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/tatinawe.pdfIn PDF document text
    • http://bibalaluroxute.epizy.com/kirby_right_back_at_ya_episodes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68cb38a3-0bb6-4ee1-9fc3-b2eefe97e2ee/libro_marques_de_sade_justine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27adc519-d75e-4ddb-ae4d-c4f72db3050e/osha_regulations_for_bridge_construction.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/75223199475.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_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 5072 bytes
SHA-256: 2433f5dd64db809e91b09fcce1a6d1219fe6d4f825417d46566ba3d10e872b76
font_01_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 10868 bytes
SHA-256: 8be787c7be9805b2d0e8edbb24989dc01fae093a915e63e36d15ac3e54d60b47
font_02_sfnt_off000127c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3