Malicious PDF — malware analysis report

Static analysis result for SHA-256 876818aee6932c05…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 13:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 090cf42c9497ed7930b28bbc0563b6b1 SHA-1: fbf294e63fab6dab56db12a9f0daf1610987ae53 SHA-256: 876818aee6932c054fab675fa012b50fc379181c9d8483a00c7d4183ea713b0a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to other PDF files, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16131856f53f1f---radafe.pdf In PDF document text
    • https://lean-ds.com/upload/editor/file/17407049962.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109080112586231.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/tobujirivarorovuta.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/49062956906.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/temaradubesopexegofi.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///vuzitikokesawetuvapewisen.pdfIn PDF document text
    • http://nscenter.cn/upload/files/lozazotegesek.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/jugudenavalopanikarogolan.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/rojudizanikok.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/70254073265.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/sukamisupufepotozejanidog.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/59454365691.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad9cbf2e20---merejapugoti.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/20140579643.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/96526416184.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/65903231740.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/53152015293.pdfIn PDF document text
    • http://lamay.de/userfiles/file/74193244023.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/leniwabafarovitixofogi.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/fifawugufixudupew.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10443612590.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/28731806155.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906122720535841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sky+movies+hd+appPDF 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_off0000d97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 18300 bytes
SHA-256: 185c932a684d4ecdaea74e1c1fa7b25aefb38828a2df93fe3fa4e1d86a7329e3
font_02_sfnt_off000120bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BB 10656 bytes
SHA-256: 8a1ccf403e08ecb58e1ab21abaef9a5ede45c02dcb5096aa8af756819b2654a0