Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb27ee0cd6b36d2…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 02:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ceab1d882781845f207f57c90c38174 SHA-1: dc239bf7365248c8f2a39fd68c23557710590a00 SHA-256: bbb27ee0cd6b36d2c5929846a5574a1310a2d92dc78a7777e1cee0280ecf4581
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a large number of links hosted on disposable domains, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ketchas.ru/uplcv?utm_term=car+parking+game+mod+apk PDF link annotation
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/nezugagazebavilelufixeku.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/maxupef.pdfIn PDF document text
    • https://mu3yc792xh-rl1.com/contents/files/loxukafijawol.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/porebazerinagapigobunef.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/70822892410.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-19/20210919120630601042.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/54985764648.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/50167465254.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/65714770575.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/govabofobenodaropugo.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/6758310091.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/89362152339.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///97143738531.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/77659020626.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/42297834794.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/mutazokojopukowopazix.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/pofogisulobomadef.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/fowomeduzepowusig.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1b7e1f729---fewewojusamuwofewituvipu.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/jowaxomadozezefiwoguzazo.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/79026476806.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cc276342---kuwekisuzat.pdfIn PDF document text
    • http://home-plast.ru/foto/files/gurofemararemuzujobejufuw.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210915222123.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_off0000b314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB314 10548 bytes
SHA-256: dae0708d62e9fb875a4ae60fc1993eedea002f3fbd5c6892e1da9abf3ecf954f
font_01_sfnt_off0000cad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD3 15548 bytes
SHA-256: 901f39daf6aa12b8c4ff82691a9c0fbbb7ebaa7b5e6fad471ff592d0d69e2893
font_02_sfnt_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1