Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7911e846fadb98…

MALICIOUS

PDF

85.1 KB Created: 2021-09-11 01:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 078fdb946f12bfdf01e465ed1bfb1631 SHA-1: 4fbc26cf84a74f40cd27c539d2213dfaea85f9a2 SHA-256: 5a7911e846fadb988f41eced0b2f4da1fcf2ace9337907338009834c742993e2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection confirming maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting the primary goal is to redirect users to a network of sites, likely for SEO poisoning or further malicious distribution. No specific family was identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tikatalog.sk/_files/file/vokorutop.pdf In PDF document text
    • https://maryamghiasi.com/images/upload/files/55084672727.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/42613122901.pdfIn PDF document text
    • http://iccarrentals.com/files/file/30723941602.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/72459984564.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/lobizamokezusonifagos.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/vumezedunatirelisijuvijip.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/lotedakegujid.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/35501998457.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/sodukatiwazekenipidijip.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/40ca034c33c6cc6570810ab6cfabc60a/82589725955.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/puwevatizukeru.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/dixosonakurag.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b23d0a5731---64195222663.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/fonekumega.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021981387727.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/wuvabalasoxanekaresegawa.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/wapiposigofokatudixe.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/87686896028.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/81794007051.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/damapazuvufurixixar.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/gejele.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/85079153779.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/febaxumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=grey%27s+anatomy+season+17+watch+online+putlockerPDF 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_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 11204 bytes
SHA-256: 422961d9008ab8c2546055402c051ff8ceb81eea58fba8ba78831e349c3055c2
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11681 17912 bytes
SHA-256: a891da1150cd51f60ef8129872c11b11c666eaee5d15150392cc4a7e1ec2fc5b