Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c7cf30539c1278…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 13:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bad81166dafb2996f3059c462910ee4b SHA-1: 802b512faf36e31a65fcef5970f32cabc5315db8 SHA-256: 56c7cf30539c1278486ac8618034ae8f8829136b74d59ee9096661f239413902
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript and a large number of external links, many of which point to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.sm.ac.th/ckfinder/userfiles/files/73514993950.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139995683f8b---bedilopibawop.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/kagodevigenirobibi.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/66526198779.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/93877347011.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/75415747418.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/84671677044.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/62701046841.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/nalenekeretibe.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/pogawubomela.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/sazanarobiv.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/ropex.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-4/20210904192327197008.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7a5817649---12802128595.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/pigujuruvapanuzapikanimam.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/xudugeduvamomabat.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/75554691826.pdfIn PDF document text
    • http://umhouses.com/uploads/files/87056458288.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/kisotogu.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/vowerukulowox.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/28567004807.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/ledisobigugok.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/89884041433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+can+i+change+my+imei+number+on+androidPDF 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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 10936 bytes
SHA-256: fee0c39a115b1690d4054b3c92c8dd83a957b5f6ab6a0491991657b5501b89d9
font_01_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 16692 bytes
SHA-256: dd7e174b401b0ad28967ad87e8d68a94b381e372de497c554bd55a49a55ce6fa
font_02_sfnt_off00011fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1