Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e06adb508474a1…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 16:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 60bdd7761049aa53deda043512af6410 SHA-1: c1e0240555ff227f49533b21adeebef67c93e2f7 SHA-256: 15e06adb508474a1926574c44da7a19947aa772b1518ceddf5dcc8120ac58c1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to distinct domains, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and URL distribution suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://riondene.ch/img/uploads/file/mabulenamuvomob.pdf In PDF document text
    • https://karlholmbygg.se/UserFiles/files/varubo.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/13613015092.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/fupul.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/jofusosuf.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/sawivamuxulamiwu.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/givadaraxusiruri.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/040234238006.pdfIn PDF document text
    • http://bienbao.net/uploads/files/fulizajomibakunerume.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/masinusejezoxawejojigulo.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/59521232208.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/80881312648.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/pelexan.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/golepevozeboxis.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/zaponetovisaboxunaka.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/pigiforijivuzamatak.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/5503119529.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/wevexediridut.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/51232483719.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/72270164699.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/19761531122.pdfIn PDF document text
    • http://weldingplaza.com/files/file/49916539243.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/58773780177.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/vetavijupemuvuteteji.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/73066237701.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/jibakewuwurofoxedum.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/ludazisalakavonisijugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=connect+android+to+printerPDF 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_off0000d63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 16540 bytes
SHA-256: 50f8061f9edd7869567d1a3f8d9503ddb24b9147007345dbdd773bbbb9afb868
font_01_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 10324 bytes
SHA-256: 3f4b94fad3e7546a041da7fd467504a1a65e06205b528aee3e53662685356c72