Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c68f9c7d98626f8…

MALICIOUS

PDF

85.1 KB Created: 2021-02-26 02:14:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 193cc1318cb925dbcf2e22e38249e3b9 SHA-1: b63ff464974d5268504587b92e1a722f5cb90dff SHA-256: 8c68f9c7d98626f8c2a89964c3c3d9e93ebf2044b452ede7f9a5176c98800284
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=britax+advocate+clicktight+convertible+cover+set+for+car+seats+circa In PDF document text
    • http://tuwukadinem.mygamesonline.org/kenaguki.pdfIn PDF document text
    • http://chuvashovfamily.ru/lire_le_ralisme_et_le_naturalisme62uga.pdfIn PDF document text
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/f44af6513616f4.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/87006574025.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/17472793970.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/32173294117.pdfIn PDF document text
    • https://dalibigexewekef.weebly.com/uploads/1/3/2/7/132712129/zuwabuvapupikirimora.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372967/normal_5fcc5c6691efa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_602c9724f3af1.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/6300217431.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/49194919758l0ypf.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/aprendizajes_clave_biologia_primer_grado_secundaria.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/posirerozikiworila.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/wonijuwufavemi.pdfIn PDF document text
    • https://temisufe.weebly.com/uploads/1/3/5/3/135384001/wuleru-fefekuwidafezef-zozexeropiv.pdfIn PDF document text
    • https://musigimipipo.weebly.com/uploads/1/3/4/4/134470090/7429437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_5fd9ae3257cb6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tuwutexo.onlinewebshop.net/25193898433.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/59448518975.pdfIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/hitachi_c10fch2_change_blade.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001124f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1124F 21652 bytes
SHA-256: 878bd68bdda19c50f345f66ec94232abc4cf719ae439fc953ecc6169a5c42cf1
font_00_sfnt_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 5452 bytes
SHA-256: 3401bec6c158604b451fcaa8221a227485e59afbb47ffc19331ed1963b65521c
font_01_sfnt_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 11280 bytes
SHA-256: 586ac827c5d371edd162311e87dbb494b824414724aae622bb90420051be2f86
font_03_sfnt_off000137e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f