Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68ce3e5b58828a7…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 15:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1acf01e971e4229bb26a4ade5c779e05 SHA-1: c18241558d6e58dac4185873823b61e9271e8665 SHA-256: f68ce3e5b58828a710bbfed9c433b258c7170c5ff7fa0fb038021a13923359d3
126 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 structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

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 https://queure.ru/uplcv?utm_term=t95z+plus+rom PDF link annotation
    • https://oxfordjsr.com/userfiles/file/belulatemaw.pdfIn PDF document text
    • http://tochuchoinghi.org/files/84774853097.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f30f028926---91446313714.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/dinos.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/bilib.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/fifuzamufezijipafebox.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/48218583981.pdfIn PDF document text
    • https://latework.cz/soubory/varosifimiwomovafo.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/24885556219.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/ladewikasufoxuzefebigi.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/38313828238.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/83371403050.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/74321134653.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/vakuwebujile.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/91136742454.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c15ac6200d---13930397124.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/wexibutesoterotuke.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/lusibojane.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109082259569989.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/vijimonexijukanuni.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/40743833028.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/46648573963.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/76264732836.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_off0000aef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF8 17456 bytes
SHA-256: dbd43fd75fa7ef2d4d05602a0f622146c2c84be66469150a0a3202749d278675
font_01_sfnt_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 10248 bytes
SHA-256: 996c306330a00c1540e46ba814651187335e8d11d48eb22b7a76f4a8c249c632

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