Malicious PDF — malware analysis report

Static analysis result for SHA-256 29bfcbf4a5908e26…

MALICIOUS

PDF

80.1 KB Created: 2021-10-09 11:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5ed8edd9c864f68378544fb32827e5b6 SHA-1: f58b3979b286bc2d50a0e4e88d0e6560eabb92c6 SHA-256: 29bfcbf4a5908e269e404ccbf9daa4fca943265f2282a3a03df79cf6e603a53c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various PDF files hosted on potentially disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or spam distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://pp-aqua.com/userfiles/files/59107124742.pdf In PDF document text
    • http://timnhanhonline.com/upload/files/puromilowijexawagate.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/jazubowixigexonukexo.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/84447677033.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/gosilafaluwa.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e7a919f9069b75b68d4bbceb15fcbf99/bepiw.pdfIn PDF document text
    • http://mobil-tech.com/files/tibolojomuverirepotig.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/52930236790.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/kawufoxilosilunixovu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eddc8d7e84---37392521437.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/wuxaferemajagejasog.pdfIn PDF document text
    • https://rippa.pt/files/file/nobavoduxonen.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/milezabedojulop.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/4324576127.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/86269246489.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/nolesugizirili.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/95776011202.pdfIn PDF document text
    • https://austarpharma.com/upload/files/55212912716.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/47474811488.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/77244702477.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/67333824862.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/77414050816.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/nivanufiju.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/35578800160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=acid+to+waterPDF 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_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 10112 bytes
SHA-256: 726cb01eb231145900d20cb98ad060c0ce0c765fc0e97cfea6ddbc637b3c4363
font_02_sfnt_off0001073d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 17192 bytes
SHA-256: 5f46b7a6e5882128439b47e342e0cb02c6cde81ab97a8feb34a1ff8f65f86ac0