Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8230ac77ed4954…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 16:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ea5377ddc55690d7c8a2a6b787bbfd2 SHA-1: 5e11ccdf2f48ea303b3833ac00ad2d5ce5abec15 SHA-256: 9a8230ac77ed4954cf19e5918d2ac42bc4c9ea666986f45f1b5503da44752b1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm used to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=no+root+firewall+internet+data+blocker+protection PDF link annotation
    • https://108pizza.pl/uploads/userfiles/files/diwugedovuwemewiwesap.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/86476056173.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/vapazomumiwomebapuga.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/sumuzojujanaxetun.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/15340565924.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/24008614019.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/15361877090.pdfIn PDF document text
    • https://shidoremicrosys.com/media/vibabodimefazakisibibu.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/80481480738.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/48682853246.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/9037163029.pdfIn PDF document text
    • https://kimcert.org/E/file/masivup.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/sebigozala.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/jigonumogupopizilusojogit.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/kitojegeboxarupe.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/renerukovamaxasazilonuzu.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/bulaz.pdfIn PDF document text
    • http://altonika.pro/files/fck/file/16810544407.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/72187454966.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/kanomekojujeselu.pdfIn PDF document text
    • http://budka39.ru/files/zepuxudigubelulumut.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381b4bcd41d---61257016686.pdfIn PDF document text
    • http://rld-carbon.com/file/48701030448.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/taxokenutarivewadudus.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_off0000cb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB21 20232 bytes
SHA-256: 94ed6338b67a424262858f7545a771682092512e33584c59dc2ae86cefefb11b
font_01_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 10740 bytes
SHA-256: 3601d2d9204686d6576015f596df948bc624462414e3d81bc047b6c93f28b635
font_02_sfnt_off000118a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1