Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b98b24ebd8c7c99…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 21:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c0c43c0bc331f28efaacf23c894fca7 SHA-1: 183fa90658cf7b75e061f9e628517a9b42c249ab SHA-256: 1b98b24ebd8c7c997487de760080bc56a818da3f09b8b1d3ee197005d3673b37
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, with one high-severity heuristic flagging a link to an algorithmically-generated URL. This suggests the document is designed to redirect the user to a malicious site, likely to download a secondary payload or engage in phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://atlastoursntravels.com/userfiles/file/vepesotifav.pdf In PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/407699002.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/22380149025.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161304e054fd32---tigevabubilovofuxeka.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/gawedevejegozumivituroro.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/fetutanejuwalelelonodema.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/85025829824.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/76921327700.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ludelenaminadugukivakaz.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16137a51adce24---medutelosu.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/44448509571.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090207494821.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/74261700106.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/wusipox.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/bidajugomirela.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/41850714491.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/vojozepegagururiduwa.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/ludivosolu.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/27018426941.pdfIn PDF document text
    • https://citronel.com/userfiles/files/numasagofoletu.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/nokarusisenade.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4q54i5d8mohi9u4srv3fdl7pt7/xulirofuterageveritotupe.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/sizifu.pdfIn PDF document text
    • http://a-pluset.com/userfiles/degadepunanitifi.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/34258369421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=vidmate+apk+download+free+for+android+latest+version+2020PDF 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_off0000d5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 11112 bytes
SHA-256: 4634a7e0825b056443dc4c911e6a462b0799a2688ba030bd5d7d84080fa522ff
font_01_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 17984 bytes
SHA-256: 2e34912181b662dfb7a0ec0219eaa79e155900a52256cfa81da297dc5f3377b4
font_02_sfnt_off00011eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1