Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebc758dcec74268…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 11:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07da0c6c8b7a8831ff58baf97d59913d SHA-1: c1e80757f4fea1a231ba4ecff5f469f4db8e83f1 SHA-256: aebc758dcec742682348b5140af430181ad3f0c57c40c8310a69f0f9ed29cd97
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs and a link farm strategy suggests an attempt to direct users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=who+watched+my+profile+instagram PDF link annotation
    • http://somsit.com/ckfinder/userfiles/files/5571297214.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210912031727.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/75368680372.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/53497973641.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/4823723403.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/welejuzitixo.pdfIn PDF document text
    • https://maviet.vn/upload/files/50943158653.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/sipumunofafijokide.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/62358828968.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/74830066743.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/98144535690.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c5f50ef7---53727351937.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/77818940476.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/819e33730dcbd4ac3ceb8630a44c6fb2/70528735052.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/76531077914.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/dujukuzidojowobi.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/34347903088.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/28250395876.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/tufebatonokovaladuvewuk.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/58985789062.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/boxasanokeleriranefijime.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///wuzewonunibuv.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mavebasowaxemimaju.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/xenabusenusomajumebito.pdfIn PDF document text
    • https://solturism.ro/images/file/86146183154.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_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 11260 bytes
SHA-256: 5361592deef85c5d34b389e44496af33165f3d9a131c6414dffdcb3b7fb79ab1
font_01_sfnt_off0000f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 18068 bytes
SHA-256: ca279fae2e2d1784978c4b9ed4ca9d819d81a39e3c4e50a08e99821fec9daaaf