Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09a3759338c37a5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 00:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 499cb99ff7fb1f0cbbd9b6e5a243f427 SHA-1: b3a428077457772be86167ca496af0e4de2b8004 SHA-256: f09a3759338c37a52a999287ce92ea65d1f4b4b8749e05704e31b0282d643ecf
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics suggest it functions as a link farm and contains a download button lure, pointing towards a phishing or malware distribution scheme. The presence of numerous embedded URLs, many pointing to potentially disposable domains, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ofcourselc.com/admin/uploadsfile/2128854284.pdf In PDF document text
    • https://elminhaj.org/userfiles/file/jirunegosu.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/rosoribovopaxidomeveve.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/gimobojulusokitamila.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/mamodalepodokalogoxivewuf.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/92015182521.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/wumagujo.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/71052563013.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/lubiwebotesigusuzidobaje.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/47144300997.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/15201795344.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/8631811154.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/jeroluxoxe.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210902180154_1411573424.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/49053485729.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/sagosugeme.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/82235799328.pdfIn PDF document text
    • http://newworldss.com/uploads/file/84976547920.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/lutavonaxubometisiwexonaj.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/51164527965.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/sesadufisedadutud.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dddebae0b---jilikusawumujupuxa.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/8825387046.pdfIn PDF document text
    • http://szm.hu/userfiles/file/45268615675.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/budosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=samba+server+android+tv+boxPDF 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_off0000d303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 18268 bytes
SHA-256: 0bf0e85b76d521404d604530454b7ff8b0bcc5c74ee3f77f3e0c975516369a11
font_01_sfnt_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD4 10748 bytes
SHA-256: d0424154787a41e6a0b33fd7731c9f5cb1e17c6a4cd03341c2f7446136604d3f