Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d76fc80945816e4…

MALICIOUS

PDF

82.9 KB Created: 2021-09-11 05:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37db67277c90b60744b4e50a7054dc58 SHA-1: 1bd0d69c957e63d5dca782309fe21550cfe7d70a SHA-256: 9d76fc80945816e4e4985926ce9cf4ad4fcec66464fa78cec54338d56fd96c14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://erictex.com/ufiles/files/badorejoruvarujis.pdf In PDF document text
    • http://thevale.us/userimages/bikuna.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/22520725787.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/vujisexikodukovapige.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/bosolowukomogupokejidi.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dapuxejitopadobu.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/volixeno.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/dexowovebemu.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/miviten.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/94884669837.pdfIn PDF document text
    • https://tsegypt.com/file/jasikose.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/vitimejatixukudawupuguk.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/fufijomelemoras.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/36794965542.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/buxezopak.pdfIn PDF document text
    • https://kham.vn/userfiles/file/zemubunafedezexoro.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/vofivuvexoxugi.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/vasunujexipibenatodopiko.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/pagasukaxeze.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/23137221945.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/61072598268.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613583ee1b05a---mimikuwinuba.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/vesemisutolajosapuz.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/voxurusabafukizijevisusu.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/64666375786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=short+tail+keywordsPDF 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_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 17236 bytes
SHA-256: 7658aebc5ce5c385b0ab37107fe5e187e0d4872978d0d071797baed3d2aead81
font_01_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12612 10608 bytes
SHA-256: 1764d3b40eb9a531da42562effb0dafb57beb7f6909606838d08126c0efd5df2

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