Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf02ca02e8ace28…

MALICIOUS

PDF

72.3 KB Created: 2021-09-11 12:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49d1efa63322cf45cf60e399e28a6c25 SHA-1: b36c4d28dd1c8548276645b0343605e1cdffbd3e SHA-256: 4cf02ca02e8ace28619e1110bd9a0e098443bcc28f6863ef7fb3a2b35b97ca71
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • 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.
  • 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 http://miet-boot.ch/images/uploadedimages/file/15793592228.pdf In PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/10613953440.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad35b69d8---27504665910.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/zogepa.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/wizawobesuzoritotavajox.pdfIn PDF document text
    • http://runhouchem.com/upload/files/vijumujepikurudepe.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210903_C78B099E11BB96FB.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/10675959055.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/47479275783.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e987d98661fab4f848fa67bbf056ceb3.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/96117027830.pdfIn PDF document text
    • http://skupka23.ru/upload/m/fakisimamiwimutul.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/44725796068.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/larapozeluburupusejozo.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/37314042670.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/14491332248.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/wikanajaregamurapufuvuke.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/bisugemunetipugegemez.pdfIn PDF document text
    • http://stattus.com/assets/file/duxaxo.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/73417059754.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a97d5c30a---kekonenomakikis.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/donedo.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/20182006046.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/kopores.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/xasabolotireveba.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/69840442633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+sims+expansion+packs+freePDF 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_off0000ba7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7D 10756 bytes
SHA-256: aa883124c1105f7d698e582e45bccfc8df4ef4e879de30e7bc6df9b6c13d92db
font_01_sfnt_off0000d30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30E 15684 bytes
SHA-256: 8a1f89cea94f8586eee890656b79d4061d2a739e671c44ca5dfdb0ed3f2300c0
font_02_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1