Malicious PDF — malware analysis report

Static analysis result for SHA-256 7378773f0d99a506…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 11:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 228aec693778e62b34848e298bffe9ba SHA-1: 4c7384e6c5c3b58f6a308d4a6b43123b297d5363 SHA-256: 7378773f0d99a50681f18715827113fa6b67a0b764c1409e61660d4081a5bcab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier, containing embedded JavaScript. It also features a large number of external links, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://ngusacdon.com/upload/files/51095922615.pdf In PDF document text
    • http://thietbiotovn.com/Images_upload/files/bamidexobeko.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/ponapukoli.pdfIn PDF document text
    • http://otczenacts.com/media/files/jojefijukarevopawi.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/poloxikerakatedepumow.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/vurepaj.pdfIn PDF document text
    • http://salkim.com/userfiles/file/75789354647.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/xademikelerono.pdfIn PDF document text
    • http://www.520amis.com/upload/files/86188556231.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/vanimevavax.pdfIn PDF document text
    • http://szhlfz.net/upload/79844727908.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/kuvugu.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/widevidalufiriwipararu.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/ragawipudepejemubalag.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/tomir.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/78920374727.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/kabimokudozo.pdfIn PDF document text
    • http://chenruichem.com/upload/files/28840863230.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/59645904405.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/18498035385.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/riwesajagefugizenul.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/geduwarakexuxodopirimuxi.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/fesirujaruwakapoloko.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210904054638003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+pe+torrent+magnetPDF 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/1In 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_off0000bc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 15792 bytes
SHA-256: 2c25d904c26dbafce1ed34c6469b163dd37c071b3c8440d7127b718a147d45af
font_02_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 10600 bytes
SHA-256: c6e26d052fda3bb42da1d41bcaf92574a26c317e25335756e4f1677dcb4e2d45