Malicious PDF — malware analysis report

Static analysis result for SHA-256 299b499cd4ab5000…

MALICIOUS

PDF

97.4 KB Created: 2021-09-12 15:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 5842839ed7d44bb71963b36f77ab6859 SHA-1: fbd0013e8b01e0987bcf7141e68674ded5c8c43a SHA-256: 299b499cd4ab5000c275628fb1456dbc7878dce69a3b1299ffa8eb8d1adcee45
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links on disposable domains, a common tactic for distributing malicious content or conducting phishing campaigns. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://studiopiergentili.it/userfiles/files/pusimi.pdf In PDF document text
    • http://titadoorbinhduong.com/upload/files/93538052067.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/44386456976.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/tesureguvarux.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/folamopobowowo.pdfIn PDF document text
    • http://teakdeck.pl/files/file/53115456545.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210910090815.pdfIn PDF document text
    • http://195exim.com/datas/files/daruxunitijetunizuzasu.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/tibarizifizepimiruxoje.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/gugekesazusowib.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/71070134988.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/joxidipepakifuvopirofeni.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/xixevumekof.pdfIn PDF document text
    • http://trivio.it/userfiles/files/sinewimuwube.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/43703836629.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4844038632.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/goramet.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/kelajexejavepiririkanufot.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/30511068327.pdfIn PDF document text
    • https://priscar.com/documents/files/rozofivikizudidugide.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/21072788828.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210905051706240997nyyft.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090714584173499.pdfIn PDF document text
    • http://klhl.com/userfiles/file/fezojosusalikagividus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tubemate+para+android+tabletPDF 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_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 10588 bytes
SHA-256: 2f07ebe2011cd3f4edbb45a0437f7df4f3c00051d0a2412bf0daaf2dac7d32ea
font_01_sfnt_off00012eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB8 18880 bytes
SHA-256: 787e3f792a3d156bf39c539dba27b95231eb639970b24883eaa419319e0fdace
font_02_sfnt_off00015fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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