Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca71707e2a34053…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 19:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d513f9d6b21ef55aebef9d29b76f0c5 SHA-1: 98da69cb8b02c97bef52813bc8784e8e4dcf1bd7 SHA-256: 3ca71707e2a34053958447efa40c42c625b2722d5c48da5d23f4a6e52527be32
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=common+english+idioms+pdf PDF link annotation
    • https://hunglivet.com/uploads/files/202109091538565581.pdfIn PDF document text
    • http://simoncaulkin.com/images/mevuba.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/22353952568.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/xetow.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/30370225019.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/bemosabisakufadu.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/sokudis.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/29644292085.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/jogaridumevelefijovekubep.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/vedumufu.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/nirobijarot.pdfIn PDF document text
    • http://ewtch.com/upload/files/xekomuzajesekodalozalo.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/tegejozifuwowuvubaz.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/35432126222.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/vevuxupenanobosibemizej.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/34580805927.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/66211056595.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091722080724.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/95289700565.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/79995996031.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/27588159598.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/tesujuzad.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/37522538725.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/povovefep.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_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 17924 bytes
SHA-256: 1db965c01d627efed6b9f6e90f2416c809829d30af93779d1958305cb9eed8e5
font_02_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 10616 bytes
SHA-256: 0370a553449d2494c652a872b55ae8e3faf8c565c8ab0f3bb79d85e2e568ac63

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