Malicious PDF — malware analysis report

Static analysis result for SHA-256 954fcd5ea0254a38…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 18:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f744ee2d9636cc077bcf180626c8842d SHA-1: c4a71d663c2a5df45e4b367a326b2b063328b3ec SHA-256: 954fcd5ea0254a38b530e018fe131fd4cde3d3c9b2082a7b8a252d56b7231c7c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://crysiq.ru/uplcv?utm_term=pathfinder+core+book+pdf PDF link annotation
    • http://fitviewer.info/files/file/bazifelovenolowawe.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/86280870531.pdfIn PDF document text
    • https://el-tall.pl/pics/file/degipanitadawa.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090617552073499.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/xanox.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/monukunanaz.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/5574170370.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/64095271206.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/fuzudaluxigikoma.pdfIn PDF document text
    • https://priscar.com/documents/files/27212089081.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210924_657F19E34E70D552.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/wugawazexinilegeduxet.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/fenimanarapu.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/20124648942.pdfIn PDF document text
    • https://bak.vn/upload/files/vadetipebewipakovamum.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-19/20210919155649843375.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/vurazugenibagotu.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/rojosevufonogoziwugotajik.pdfIn PDF document text
    • http://nature-revive.org/files/file/4230192567.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/jokefu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16149a20451741---75450952893.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/xolutelazi.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/gijaxatu.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/86391671145.pdfIn PDF document text
    • 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_off0000b280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 10736 bytes
SHA-256: 316f6e37dbae6b5f794a3ab658fd4e44eac60ae161ad767e7293f15788bc158e
font_02_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 15656 bytes
SHA-256: 9a7650bc8c3525d6aa025289a896d2ae97177e57d00681b5b6c94bf0b717028a

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