Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bad064080793dd…

MALICIOUS

PDF

98.5 KB Created: 2021-09-23 16:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b21a7c5112578d2798363bedcaf977f SHA-1: c7ed24999965fd0f0ba8a347aa9d554bb010598a SHA-256: d2bad064080793dd5e4ec7e379b6a2b2c3b36e6d1a8de284edc143df16ddacf1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external PDFs hosted on various domains, with a high-confidence heuristic indicating a link to an algorithmically-generated URL. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://swatimishra.in/uploaded_files/userfiles/files/zazuridanixojakinagup.pdf
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/30365068219.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/rewapumolugenuwigovusixuv.pdf
    • http://paolacaone.eu/userfiles/files/69000226363.pdf
    • http://uptindia.com/newsimages/file///dotolumofumexi.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/xuzagaditopurutubo.pdf
    • https://zenithoverseas.com/assets/userfiles/files/82690679950.pdf
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/wisodadabe.pdf
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/falafit.pdf
    • http://samocvet.org/foto/ck/files/10552746282.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139b447067fb---gewofisaxavaniwo.pdf
    • https://fleuriste79.fr/ckfinder/userfiles/files/kotofevubijebu.pdf
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/39443312634.pdf
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/laluxagedeti.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efed77e700---52242422526.pdf
    • http://forter.vn/hinhanh/file/91018641948.pdf
    • https://osikovo.eu/webroot/img/content/files/daselikov.pdf
    • http://mprime.net/ckfinder/userfiles/files/xaloroturasebirura.pdf
    • http://sitoad.com/bbqjoekey/files/202109200834123929.pdf
    • http://ambulatorioveterinariovianello.eu/userfiles/files/48134624451.pdf
    • https://sharks-cz.cz/images/file/25934951559.pdf
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/bigobafukajitetonupareliw.pdf
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/lifasakapar.pdf
    • http://golfvillageonline.com/userfiles/file/bodatimudalomezisamod.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=escape+room+movie+watch+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111db.bin
defa78dcc99b70729c78b710715a5c8571d4a9c549b58533a25825b6a935277d
pdf-font-stream PDF embedded font (sfnt) at offset 0x111DB 10880 bytes
font_01_sfnt_off00012ae2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE2 16792 bytes
font_02_sfnt_off000142f4.bin
63d999ba3c7711dc80efd9c4aff6d7e4ed471d0470810d4ede9eb2e7fb46afa7
pdf-font-stream PDF embedded font (sfnt) at offset 0x142F4 21380 bytes