Malicious PDF — malware analysis report

Static analysis result for SHA-256 b510a55a9a06c024…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 03:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 32b3007a49497fb49df106ce01cf17ec SHA-1: af9ed890b33cda764229d5d4c9914817256a1899 SHA-256: b510a55a9a06c0242bb87a5e1548c51aebe4dcda310a2e5be264d82bcb7b6788
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, a common tactic for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method to evade gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/uplcv?utm_term=online+pdf+pass+remover PDF link annotation
    • https://adian.eus/files/galeria/files/mezurat.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/fewuserinipovepotejini.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/35474041864.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a63b199234b2071b22f26d3730b8a944/zaseradodig.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/xeweviripimigowawupodu.pdfIn PDF document text
    • http://rilta.net/userfiles/files/xujedidus.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/tipumigabolevifev.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/texotofefepejabet.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/89335164921.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/12496971930.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/82137136074.pdfIn PDF document text
    • http://decorstore.eu/upload/file/penawoxi.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/18310848615.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/genat.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/41851997679.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/79042051024.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/24166125688.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/7544527326.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/lewowodevagiwumijewina.pdfIn PDF document text
    • http://sinostandards.net/upload/files/sidanotijod.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/cf0dd070e17f1756c994cfc2769c08f1/49700704466.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/wuxogedatenometafuki.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/83419554273.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/rasakiwexovidetiloz.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_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 10652 bytes
SHA-256: fb76147e2b419f66d460ee819b2c584ecfa08d208cc5225c019ed991b1d9a85d
font_01_sfnt_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 19392 bytes
SHA-256: 2185f5b264e5e2a51e047ec7e2ec23399e399a6911cbf4d85f655851180185fe