Malicious PDF — malware analysis report

Static analysis result for SHA-256 a967f9d48c11eded…

MALICIOUS

PDF

73.3 KB Created: 2021-09-10 23:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae087c8374481c2671c87cfadc371eb5 SHA-1: 544128aa3fd4dbf23d3f976b239fb2ae14fdbdff SHA-256: a967f9d48c11eded5394ba82881b21a0f3deeface79ee804f39dcc313f10db01
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archetipoingegneria.it/userfiles/files/72443307001.pdf In PDF document text
    • http://104408017.linker.tw/files/linulutobowasagedusebefo.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109041945474235.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/82439651652.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/fukujubegikejuk.pdfIn PDF document text
    • http://spbi.cz/res/file/45749310713.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/konafukatufiselaxufo.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/kidimumebixo.pdfIn PDF document text
    • http://chongros.com/userData/board/file/niwixojagowoj.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/vugabazowegebuk.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/955642059.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/kusov.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/27379491295.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/6242146475.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/talokesevinumagexer.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/76411063038.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/linemod.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/nabufa.pdfIn PDF document text
    • https://kopari.hu/files/file/74023921616.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/17663620617.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/xelafusuruk.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/ribaworefobagame.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ef70cc1b8---65739721626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=get+free+itunes+gift+card+codesPDF 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_off0000bd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 10744 bytes
SHA-256: 15455c331bbffba03bb89b84bf0f96a52f7f50006c9135a375ae1fea354232f7
font_02_sfnt_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 16120 bytes
SHA-256: 1f33814b01afa10d78bc993feefcec838ff6c781e840af315d4600a6e4409ef3

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