Malicious PDF — malware analysis report

Static analysis result for SHA-256 79564fbf0ca2747d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 14:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 38986fb8c5d7dbc82399ea2a1edd6f34 SHA-1: a7463ffb38d358a70ac881459e9c744e0696b093 SHA-256: 79564fbf0ca2747d4e952b5194d0f05b18eedb6d4ec7b334a037251ce829d6a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://phm.vn/upload/files/wedomudawogulazibu.pdf In PDF document text
    • http://missteenqueenuk.com/userfiles/file/54072523044.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae405b86df---24189415923.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff937f4de---zeminujolulonoxiterexol.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/rurojesofazobumuvejuged.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/xixasumegisizodiso.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/45680873094.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/mizefawilavivunazi.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/vawami.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/30721476794.pdfIn PDF document text
    • https://ivanamihic.com/files/ruvagidezabuwavunilalo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/julofefegejidazodamawojo.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/86872558671.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210922191949.pdfIn PDF document text
    • https://davnosti.ru/upload/laluzelutorikizudegog.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/roletuvuvisuredexipaxu.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/63465210194.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/dikitixopuzategefubira.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/resexitupewi.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109040223051704.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/32669396584.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/12289330446.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/baruvesurajojire.pdfIn PDF document text
    • http://greenld.com/userfiles/95139419000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=justice+league+snyder+cut+harley+quinnPDF 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_off0000aefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFC 15048 bytes
SHA-256: a31f8536751a29402a7f377a2ad2bacb266a0cfd0e7a05d1054d75be15279e1e
font_01_sfnt_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 10880 bytes
SHA-256: 848b433926dc4f3e6ab91cf7a5e531cb65b5202bea6cc8528586c7811794c2f2