Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a5253feed87901…

MALICIOUS

PDF

82.9 KB Created: 2021-03-06 00:02:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 875bdadeeb44a979c6f7b1a13e500b21 SHA-1: d2cf60d5971904282999039b40453e4c6b60cb7e SHA-256: 74a5253feed87901f5a50d7d41a11674b9f10d57031f469cecd6809d22038c09
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary URLs points to a suspicious domain, 'baarspo.ru', which is likely part of a malicious link farm. The ClamAV detection and ML classifier also indicate malicious content, suggesting this PDF is used to distribute or host malicious content, possibly through a phishing or SEO manipulation scheme.

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://baarspo.ru/strik?utm_term=the+eyes+of+the+dragon+book+review PDF link annotation
    • http://wepisoja.mypressonline.com/how_to_find_the_limits_of_a_piecewise_function_graphically.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_6039457dd784b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_6014a06d70d8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_603700826dd5a.pdfIn PDF document text
    • https://ketawisu.weebly.com/uploads/1/3/1/4/131454029/1882820.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/mastering_regular_expressions_python.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/lista_de_verbos_regulares_en_espaol_presente_pasado_y_participio.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452850/normal_5fee3bddb2406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379971/normal_6023f3bc6e66f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376629/normal_5fce8dd4e70ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487382/normal_5fcd11f399479.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/fuver.pdfIn PDF document text
    • https://lekudelido.weebly.com/uploads/1/3/1/3/131378953/zojujozukavubez-tiwif-sokomenipug.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/sazariwapa/noma_snow_thrower_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/types_of_temperament_and_their_characteristics.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/62029034819.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/livenol.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/stairway_to_heaven_chords_during_solo.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/tisev.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/floating_vinyl_sheet_flooring_menards.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_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 5544 bytes
SHA-256: dc39be3b5ac45e9139c80aabab26ab4e314d9208dc959b9cfe5dc561cc21a389
font_01_sfnt_off0001171f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 11656 bytes
SHA-256: 0158128058da8800fa5ec750631cc4c9853f2195de489e2c82f12282f8960557

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