Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a08f9bfe9a1db87…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 18:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86349d22eaaae549db3614063d0de02c SHA-1: 8d25ee69203f92791367f800fe2383f10efbfafb SHA-256: 8a08f9bfe9a1db87e7f552d606210b6acdc6a60affe1eb5bb02b4c5ac3af2a03
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS heuristic strongly suggests malicious intent. While no scripts were directly extracted, the structure and embedded URLs are indicative of a phishing or SEO abuse attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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://nutronicltd.com/userfiles/file/vepisusanapel.pdf In PDF document text
    • http://constantemail.com/userfiles/file/1631987256gasibixiwafibu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/cg7uqok9pjh4ib8ldkr8ropuv1/38085842463.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/jemexelug.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/wopejavora.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/84005538965.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/telelopaseseduvugofos.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/97104708161.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/jedagana.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/rokebigalig.pdfIn PDF document text
    • https://profesa.net/userFilesfile/98712578831.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/1381984037.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/21590822127.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/30400375886.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/lowuxasapiveruzorejame.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/siroviboluduzuvejerega.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/gatevakusanorovu.pdfIn PDF document text
    • http://e-sheremet.com/img/vofufolavakefo.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/76054058018.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/zejilipa.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/90251229632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+restore+iphone+from+androidPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/55879013170.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_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 18836 bytes
SHA-256: 0702121c3a22e848ec7d37a6d579f16a6b8a6dbc3683602aa04d20ba38f87b3c
font_02_sfnt_off0001209a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209A 10792 bytes
SHA-256: 5cac178d6dc4a8be5ecf8c0391d719d9e565cec2c3877fb3d5dfe042b9420f05

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