Malicious PDF — malware analysis report

Static analysis result for SHA-256 d678a17d7b324cac…

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 09:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 232c32a1da9dc9b6093a25c4848bfc97 SHA-1: f0a7fa637d159b74c0555c7594ac5fdd179a2e76 SHA-256: d678a17d7b324cac3f5c8050a753b7f1ccaee0b5804ead9d41e0dda7d4ae5031
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded links, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm designed for SEO manipulation, likely to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://balarampurblock.in/ckfinder/userfiles/files/18756854832.pdf In PDF document text
    • https://demideopool.ro/ckfinder/userfiles/files/tigepororufofixe.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/77631737786.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/wilovunusumakir.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/gaxekojanituruvexez.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/tasodixapixexev.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/7635565000.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161385f970595a---59386575819.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/97867300336.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/94296437493.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/7375902650.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/pozinuzenoturedomigel.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/zefanos.pdfIn PDF document text
    • http://inphilong.com/upload/files/36909852676.pdfIn PDF document text
    • http://snft.ro/media/file/lakokazu.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/momofadujovifezesunoro.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/3603742551.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/57364768614.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/gomazuguwukenaripojebibig.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/40923329896.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e1ffec93f85961e26b330b105a900955/32308668335.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/bujukamivuzofufufegumodo.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/9640447439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+download+bully+game+for+android+freePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60B 10960 bytes
SHA-256: dcdd7c0d5c1c9d7254872c293fcdad3fe221de3afe159410ae8b38ccd22bf3eb
font_01_sfnt_off0000cf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 15064 bytes
SHA-256: 20393e861225cdbf4585a340d106f416b42f6c555098266793cfd27675a62bb7