Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cbf8cb6194566a…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 12:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d00b7949351bb269db46314f33815218 SHA-1: e9d8727fdb8f5e913ca13c46c65f13da8ae0af3e SHA-256: 13cbf8cb6194566a4e523b7b5c82bc034f441d71661ac1de3847de484f154319
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URIs were extracted, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards an attempt to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=snaptube+new+version+2021 PDF link annotation
    • https://amigo-shop.105h.net/upload/files/fomozapebidedemowiloje.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/28640133341.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/fudine.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/nubawekode.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/51390114924.pdfIn PDF document text
    • https://resicolor.com/upload/files/82320351690.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/92996693281.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/3071058536136639cdc186.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/worijiduvekevezowavadu.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/fanozeboxezusisavalopekip.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54013734297.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/50358005774.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/14514167070.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/lovoxidajomadozolu.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/20457366906.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda978b35b---rufupazobawon.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0879931001630998922.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/nurot.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/varolirixixamudad.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/7341705778.pdfIn PDF document text
    • http://jonellchem.com/upload/files/63381965983.pdfIn PDF document text
    • http://tuyendung.btccorp.vn/uploads/files/89687065497.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614cac4ed2e72---rulotawolozekejer.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/56466246296.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_off0000b19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19F 14864 bytes
SHA-256: 2e76cbe048037b4eef1efdc4b6d70109dd7f1f395e9590a6c3bbb328f71494e2
font_01_sfnt_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 10960 bytes
SHA-256: bcea0335c63afe80898c4b3f650d48e89656bc515909b4b502133baa100d5c52