Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa100dcabde5d41e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 06:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: edb3aecc8cde4c506b7f4fafb7dba166 SHA-1: 4b913243a39a2814a4e9fdad1600ed711b3d645c SHA-256: fa100dcabde5d41e465046587e409156196c1fb4a044903023056ac876ea9743
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to other PDF files hosted on various domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a potential SEO manipulation tactic or a way to distribute malicious content across many domains. No scripts were extracted, but the overall structure and heuristic firings point to a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://reutlinger.pl/userfiles/file/83014207596.pdf In PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/kafexovesife.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/xomupubiritamosexudetag.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/jolixezamekasidusizemi.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/lujonekubifofidulupatoge.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/29444036363.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/49326544909.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/68912659687.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/23997640386.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/belepexizikopasab.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/vevonurewix.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/24874706137.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/55443229552.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/79572856695.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/37772301437.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210911064828.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/ganimili.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/kififovujukukojolep.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/tidawimos.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/fabifujuvidedafubamunuto.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/pesoxipefavutepes.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/58926909610.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161460cac4b909---govoxob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sketch+club+for+androidPDF 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_off0000b26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26B 18000 bytes
SHA-256: de9f9c9a29d0a3f666756009ec0b76b846915274effdad84eecf237790fe7bab
font_01_sfnt_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 10812 bytes
SHA-256: cb9a627b60d62f46cee579f49a40cd434660a72a157578aa62181c387125eec9

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