Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ac00b7d06010de…

MALICIOUS

PDF

77.5 KB Created: 2021-09-14 00:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40b3726e8ea9a712c2455c3fdee156a7 SHA-1: ab6e788a6f391213bdc2dbd3362d60caee3584d4 SHA-256: 88ac00b7d06010de0f7cf014cc42ca46768cc21ca563cc9d16dd66ed51ea9bfe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://cructi.ru/uplcv?utm_term=balaji+tambe+garbh+sanskar+pdf PDF link annotation
    • http://jiuxingchaoshi.com/uploads/file/060133582765.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/vunik.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/wijifowaseva.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/zewakipekadesixilos.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/71826091325.pdfIn PDF document text
    • https://shibbirs.com/media/files/foxemukalokogowokidesakot.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/dobukisesakorotetini.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/66832490143.pdfIn PDF document text
    • http://cecev.com/stockages/files/50705216613.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/zudadusimavedetaw.pdfIn PDF document text
    • https://sealskinz.ru/files/file/44446129715.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/96656285477.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/wegesuledofajiruxovemaku.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/65271477186.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/bebajotowerudipoli.pdfIn PDF document text
    • http://analhospital.net/file/files/pijaxomiwupavipepejoxuli.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/61512510722.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/95179281478.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/bobopunidalijijididaj.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/roxewitubelowawebekom.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/rukuzamuxat.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/wuwojobulig.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/33433270069.pdfIn PDF document text
    • https://auto826.com/uploads/files/86090249867.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/50962621659.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/gobaridinobadovebi.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/86965119270.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://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_off0000cbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCF 11240 bytes
SHA-256: eba041f99b736843f9b7a8a255ff2cb513a4d19abfa74afd608d178ba3bee6f2
font_01_sfnt_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 16560 bytes
SHA-256: eab9414a2d134b841eec4c595227a0161beb506c861ee34c32a9121ebb94769c
font_02_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1