Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d91c3bae182c0eb…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 19:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d99c3946fd68c6aa235730d4f7da4f11 SHA-1: 5d043903a64358fde65b8410ca74b48a30934822 SHA-256: 9d91c3bae182c0ebe6632eaf11390f777650fa6d4d3733e603cb587943b46304
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to redirect users to malicious websites. The PDF structure and the presence of external URIs suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nghiencuuykhoa.com/uploads/userfiles/file/kasewonewe.pdf In PDF document text
    • http://kbinteriery.cz/userfiles/file/22153008574.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/kibuvubodexumeko.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6qtvi8kh7or3ld42eklg4is9pn/26304284821.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/20134899920.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/depeniwapimitolofekerexe.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/81991436428.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/tokugorikitaguzaxik.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/41854700846.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/tidalaninoxobepenanevad.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/70890026707.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/xogasizikazix.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/jomumuri.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/39625702565.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/xukeworojupej.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/topazeliw.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613955064ae04---15452147203.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/mowolovukugexirape.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/33087657253.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210908070756_kgnk64.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/gijobex.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/wunafip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+i+get+apple+emojis+on+my+samsungPDF 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_off0000d76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 11056 bytes
SHA-256: 1273363a09334899f9c66ab89bdcd9c9db59eb4ae929aeb85847feb99bea62bc
font_01_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 17516 bytes
SHA-256: e2db85231516c28d29e8768bea4e9a40ede20035db5f23817c15b0ab23d95930
font_02_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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