Malicious PDF — malware analysis report

Static analysis result for SHA-256 785ae6e21b6bf8fd…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 01:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cdefd818ff748ed4e448072ac68c3fc4 SHA-1: 194069a5a55e2dfa3b02e9a3ed40a9c74dbbc255 SHA-256: 785ae6e21b6bf8fd7186830f6c9cc7f581451fd734b0134f7b7a00c6f14f105c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous distinct domains, many of which host PDF files. The embedded URL with 'robux+money+hack' suggests a lure for online game-related scams or phishing. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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.ctnphrae.com/ckfinder/userfiles/files/patuwexumilezugabi.pdf In PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/mapimaga.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/90933707292.pdfIn PDF document text
    • http://sns.hu/_user/file/xidefebikuvotejowudeg.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/temuzozozuxisawela.pdfIn PDF document text
    • https://dhesient.com/media/lapuxozukem.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/sisomudatomebemumed.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/88792054680.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/reburujepu.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/gixosufareli.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/fujifobojuzanonodokog.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/lusag.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/susuzajoribizu.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/62832203539.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f0ccad56f---77168142221.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/fobone.pdfIn PDF document text
    • https://ienter.bg/files/83423894076.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/75599924041.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/49282422573.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/92604376190.pdfIn PDF document text
    • http://learningkey.org/userfiles/54998754050.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/kirajuxit.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210902134449.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/5635953636134eb0b3910b.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/2102240427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=robux+money+hackPDF 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_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 10584 bytes
SHA-256: a0da57bfb3d50eb089cd0f0ef7744e7d3d00ee9a7908e662d5444acd97773779
font_01_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 18424 bytes
SHA-256: ff922a4f3bfce637d1008f104a73798002c00fcd20879810b0d23db92fe7ee71

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