Malicious PDF — malware analysis report

Static analysis result for SHA-256 11715763d94e0b8e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-24 08:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: eafef132e69fdcabe6d79aeb98ca8855 SHA-1: 96c968c1aec8851a8d664750857f733cc8c65bbf SHA-256: 11715763d94e0b8e86b314045dc9305505f92f7262fbfa87b6a77bd879c8f840
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://minhanh.com/files/91172953690.pdf In PDF document text
    • http://gardens-spa.com/user_pict/file/96187583862.pdfIn PDF document text
    • http://steinemann-ag.ru/31096159525.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/kadelezezudevogonev.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/66191883161.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/13291235005.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/55543480340.pdfIn PDF document text
    • https://panama4d.com/contents/files/39703124781.pdfIn PDF document text
    • https://baglab.pl/galeria/file/39831119508.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/takobukefuxona.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614d06d6c3210---bafobaveludalasixoxatitex.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/87960662258.pdfIn PDF document text
    • http://186086.com/upload/files/sosamumetabu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/qqao5hr9jq3e6ps25ojp206sor/jufotijiginumekajuxuso.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/jofoluteji.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/veniwowed.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/21368884452.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/96402698005.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/24885908412.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109161417164687.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/jozomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+iphone+bluetoothPDF 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_off0000b324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB324 10380 bytes
SHA-256: bd272809c147c9fb800d1de773719a788425ed14089e69f08e946dacdaa5b599
font_01_sfnt_off0000ca39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 19280 bytes
SHA-256: a6f1d32dd6882368b8067449d42b9cee8c3eb1709e9e6267c708b7c61753a117
font_02_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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