Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b1fc4892d070ab…

MALICIOUS

PDF

80.4 KB Created: 2021-09-24 08:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f8a6a7ee14b9e9d32b5f71e1c911b32 SHA-1: 5499599df3fffe53cea9144b3b324687a5e9c801 SHA-256: e8b1fc4892d070ab7503ff174c1b5200f319b2878c4533ba32763558f4c8a316
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9168

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://archism.ru/uplcv?utm_term=vsco+video+editor+apk+free+download PDF link annotation
    • https://orangerun.re/photo/files/sikixiwufazadis.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/5872017142.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/16528307285.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142d8159a39a---86217632864.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/vajetok.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614700b44b3c7---46326228976.pdfIn PDF document text
    • http://dgkno.cn/upload/51115452853.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/dasizebegegebotute.pdfIn PDF document text
    • https://phunhai.net/upload/files/nufenupopapakej.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/59598950089.pdfIn PDF document text
    • http://naviway.su/upload/files/23965346869.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/votovaxita.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/jazamupibunade.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/sijawamixivomovowi.pdfIn PDF document text
    • http://futiandj.ntgis.com/UploadFile/2021/09/22/file/20210922_215705_159.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/nuxigazevijatezezosidu.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/tuwagofitijiloxolorazenov.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/somuzazew.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/lakobavixojo.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/34512805140.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/88335855398.pdfIn 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_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 18320 bytes
SHA-256: ecea700cb9c73473da0d3ceaa71ca324d456c14a98f8a9d33b91b9b451d1d483
font_01_sfnt_off00010d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12575 10824 bytes
SHA-256: 934dab4f4d581748825604e79d141021cb21199eba6dc104095ea8bb13667482

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