Malicious PDF — malware analysis report

Static analysis result for SHA-256 7416b9391b3c16ba…

MALICIOUS

PDF

72.3 KB Created: 2021-09-16 02:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e5b8239101d4735fa33529e043f29e6f SHA-1: 256ee73e18fc3b748b362793ea60e83484e7be40 SHA-256: 7416b9391b3c16baa300b70556eaf8c53fdc75b5c1e88f05506cafcadead0941
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are structured as downloadable files, suggesting a lure to download further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, reinforcing the phishing 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 https://cructi.ru/uplcv?utm_term=os+10+launcher+apk PDF link annotation
    • https://vivaldiroberto.com/img/files/mediafiles/file/49572639251.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/tewalujekijivexemidomi.pdfIn PDF document text
    • https://auto826.com/uploads/files/63716032644.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/14333205225.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/47563311951.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/zofovavu.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/90381488033.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/xevijoretomale.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210905235036.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/18003868421.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/5560894002.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/bapadenitexoxevu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae7f406d8---wilesadegapepugizexefadid.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/rolomibanap.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///xuveresanakuwebaloje.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/bepovoxisobewo.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109032257142203.pdfIn PDF document text
    • https://thehouseproduction.net/file/15201605298.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/90551212612.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/29813932322.pdfIn PDF document text
    • https://pisausakti.com/contents/files/nuzolumodijedo.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/21847024966.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/28136178952.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/zenoroxibuziwazajopo.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_off0000b664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB664 17560 bytes
SHA-256: 978f7001e38c77f9bdf1e8560bcb08268228c712df9450bb88a0614549688137
font_01_sfnt_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 10552 bytes
SHA-256: a964dbea81ec043c03104bb9391d26fe9a4258ae1c4249137afc39945b0be0d1
font_02_sfnt_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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