Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b91ebaf4cc801c…

MALICIOUS

PDF

77.3 KB Created: 2021-09-15 19:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8bea1c862963dc1cdd3a818e061ebe11 SHA-1: 2e0726173d57d971b24187303a1cd5b71926a424 SHA-256: 56b91ebaf4cc801c8d8d67fa7205c73039b452e555f84ae7f5d92b0379994f76
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363512a2b81---gekixalalodoxugepibu.pdf In PDF document text
    • http://mobitransjogja.com/files/wapojupopojavosutupuxipe.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/40202193995.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/56452402718.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/kevitobeta.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/33449097034.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/mokolerezu.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/bazuwewolanez.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/mevelatatadanisi.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/6120284748.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/tuwudasakovik.pdfIn PDF document text
    • http://allasclub.com/campannas/file/43743240902.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/77550029702.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/dufuxikibifivixefiw.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/12249196843.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/39073238399.pdfIn PDF document text
    • http://machin.kr/userData/board/file/jawiva.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb56e097b9---82534060874.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/75792261467.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630980425.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/suwumegajisemefaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=square+root+property+calculatorPDF 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_off0000c902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC902 10440 bytes
SHA-256: d0302b91e954f1f00ac148d45897acf01d07f740405414201fde7e899e286309
font_01_sfnt_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 18192 bytes
SHA-256: 063a5e6fd8de7ff8517a1b4d0a486ca2032119af6a577ed394ac3b1bc8b27a92
font_02_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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