Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18dc6b2e486bc78…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 01:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fed77834c0a0cef1f8db5e9ed4d4d1d5 SHA-1: 1d0d080d3d7a6cdacd28835c912de9b3fd7d7aba SHA-256: e18dc6b2e486bc7808374720881d9da43e6012f4544726fcb5bf27db5686c768
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URIs pointing to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of links on low-reputation domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of external URIs and the link farm nature of the PDF strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=m1+mac+dual+boot PDF link annotation
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/24924031042.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/21365030243.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/66515631457.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/45215224786.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/zapotomorulakewa.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/20850570800.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/36961341982.pdfIn PDF document text
    • http://shopabrang.com/images/files/vikuniwekibokopanirololoz.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/taretolod.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/bisamipidipejemubupasem.pdfIn PDF document text
    • http://synhbio.com/upload/files/73673300823.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b041ac3a37---woxikobi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/wisonewose.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/9052612500.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/derunexobitukema.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210903230815.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/3328541018.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/20093626846.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/muwedegajewijawinola.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/wosekivuvidakuputu.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/sozabi.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/rumukuwawutig.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142eb0e82466---ripazuwazojiv.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/tatav.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_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 10220 bytes
SHA-256: 20bcf882427052d44a70852fdf2b34e2a85f2568236c037a78880023fcf11763
font_02_sfnt_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 17584 bytes
SHA-256: 8ca5d81bd0497a774f49e3759813ab2001dc7a11ae6663c4f612cfa431e15644