Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcea88a0b2aef877…

MALICIOUS

PDF

85.1 KB Created: 2021-09-13 16:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 477d23ff542f04cd6275f171a16629bd SHA-1: 3b4fc1b5432caa6277cc2be3f2ad0d92f85e9fb2 SHA-256: fcea88a0b2aef8776db0c45cbf8d6fb9fd9b844df0068145fbf670f635aece05
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous URLs, many of which point to other PDF files, suggesting a link farm or distribution network. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://thephinhmienbac.com/upload/files/powisagogeborilasum.pdf In PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/dotekawosinefivelajoz.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/35600642642.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/16637476361.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/jabodi.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/lofajokotewama.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/24921067543.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/43969335313.pdfIn PDF document text
    • http://sayarbobinaj.com/file/pateved.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/vijisedatamakuto.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/zoselenigokokelinido.pdfIn PDF document text
    • http://sparkpro.lv/content/file/58799323823.pdfIn PDF document text
    • https://makenie.com/upload/files/zijej.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/xizedapebenewi.pdfIn PDF document text
    • http://elitk.ru/_files/tuzizakewumexidu.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/bonisunozijatuga.pdfIn PDF document text
    • http://lex.tj/img/file/pezivijexogupuvuva.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/pusawexosuwiratotogunegug.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210910030135.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/78219098956.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210902130807.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/wovisudisekemekosowadik.pdfIn PDF document text
    • http://attlas.center/userfiles/file/81456901814.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/66173895655.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/81672215319.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/20445375012.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf15f92f0a---dojasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=going+postal+terry+pratchett+pdfPDF 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_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 17948 bytes
SHA-256: eb12aa0b9b5807e3a09c889068f66e83c6e3a924c169ab901e5d6e4b8fd95028
font_01_sfnt_off000114c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 11052 bytes
SHA-256: f894fccbef74d30b0d57a302f9efaf3c813f1471fa7c5be08bd7174b1c91a125
font_02_sfnt_off00012e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1