Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfeb5b6107017b7…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 11:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dbbc9955d22e1f56aa552077411fa00c SHA-1: 43f60965ceb7dd6d2d29a38667f9b8a09a8e57e9 SHA-256: 8bfeb5b6107017b718ab3075cf24ba865afcadeed137645e122a86306578ebef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an intent to redirect users to potentially malicious sites for phishing or further payload delivery. The document body is unreadable, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ehbo-oostkapelle.nl/userfiles/file/99127348484.pdf In PDF document text
    • https://westhygiene.hu/editor_up/zadazidin.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/ziduwo.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/boxezinaxasonuza.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/xofufefofumabokewemitew.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/13716038101.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210901221627.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/sadovudegilabif.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/paparenonaludizefija.pdfIn PDF document text
    • http://sinners-party.de/media/file/878891534.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210905112648.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/vigedufip.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/xewas.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/bopunitinutatiwatewirafox.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/ganerezugumaxaninusetoxa.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/11885742063.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/53924029719.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/44429224581.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/44918179520.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/33304464905.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/95697605623.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/xasepezulinawatoxosam.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/sazemosavokibemime.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/zovuzogodapawez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=f+major+7+barre+chordPDF 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_off0000b822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB822 16592 bytes
SHA-256: 74f080500e8ea82677d4222e8eea6a0bf4bf509260390df5a6e29826a6718b41
font_01_sfnt_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 10424 bytes
SHA-256: 8aa3095735ec164d8bcee0ffdaa91a5f795937b44ef34795708c84bf0af45d2e