Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d87779b913a66b4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 05:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: ce1f8baa73e1d352e15769bb89dc9657 SHA-1: 702fde2c5c46a1ed681ce82fd8bb0ef5a3287fcb SHA-256: 5d87779b913a66b4a16c1195301c4d916d954b0710abc1c72caf19d866c410d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mehreganimaging.ir/images/upload/files/70075921091.pdf In PDF document text
    • http://schokoladenbrunnen.de/idata/mapovumex.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210912235247.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/79521123858.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/20660600174.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/59835910272.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/21463187594.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/15324218119.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/38712385989.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/bajotakelavojeguzo.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/jafejozesu.pdfIn PDF document text
    • http://vln.nl/files/file/tarafemulokoramewig.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/74622131005.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/78510342043.pdfIn PDF document text
    • https://ccskin.com/geektic/files/86370642516.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93947157097.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/11538829548.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/54822198511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=plague+inc+hack+iosPDF 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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 18516 bytes
SHA-256: 1ec6c110461738c325d5dfa9b1e1dc049d9747740479a3540c8350ee62f48ffb
font_02_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 10504 bytes
SHA-256: 169c57feb655604def731394c36dd526efd5912bf46d664555e03ae86acbe136

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