Malicious PDF — malware analysis report

Static analysis result for SHA-256 feac4948b027b03f…

MALICIOUS

PDF

87.8 KB Created: 2021-09-19 23:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 57ec705e2993d85059b8cf95309833c1 SHA-1: 74fefa083911b3ceff7741a44c12245987722eb4 SHA-256: feac4948b027b03f5c92c128a0b3d035ac15aec9078c6e939db825ba113c448e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure strongly suggest an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://vcvscr.cz/www/www/fckphotos/file/xebelunedivegobevekaturi.pdf In PDF document text
    • https://sedefartphotography.com/resimler/files/83549201457.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/85385914139.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/fadiraxukesenuvedadoxabak.pdfIn PDF document text
    • http://btfa.tw/upload/files/88911080584.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/livotab.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/nozanevarojawixawumutu.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/rupiwobotidokufozavifasam.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/55560055739.pdfIn PDF document text
    • https://cardolf.ro/files/28381256464.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/xojobulo.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/pojinupinizavaz.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/bigokosasuzenabubuwudeva.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/67171819630.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/54838904771.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/fuvisuva.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/42627595043.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5f5dbb2d1ca7a2fc8c90c7a3dc6590a0/forajidakagozejuwu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5d168b3ae---ketemizimuvufeke.pdfIn PDF document text
    • http://rsst77.ru/upload/files/januno.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/desonupedinonumiregeriza.pdfIn PDF document text
    • https://123natura.com/stockages/files/33792672557.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109070304089589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+app+to+root+your+phonePDF 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_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 18152 bytes
SHA-256: 2770418794bb873c7896b3de42906c6931304702e47de8a6105e77ae6763fa0c
font_01_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001399e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399E 10480 bytes
SHA-256: 67d574e34b2ca3727cdf6a2f82a43bcb2c3d83a992473532330ba6d57bfd4f40