Malicious PDF — malware analysis report

Static analysis result for SHA-256 7708eba6c62665fe…

MALICIOUS

PDF

67.8 KB Created: 2021-09-27 13:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c4c01b146ac3af5d0873bc87de2ae483 SHA-1: 012ebac063a8df9415176df7fac81f29a3673bf0 SHA-256: 7708eba6c62665fe83c4c183fecb814e2ba1c6173ba60c35b8429f5ec3b8cac1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, with one prominent URL suggesting a lure for recovering lost documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=recover+lost+word+document+android PDF link annotation
    • http://www.horakgolf.cz/ckfinder/userfiles/files/49280691305.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/67455712853.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/faxazelazu.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/70212688999.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/befawojezedor.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/75562776084.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/nizefomoluzeji.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/giwiponofaganiwup.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/4366675256.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161488ad8062db---89652671113.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109102136265665.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/7803103590.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/79374249781.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/sudadiwafakolamuvukef.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/tiguvizutobiguz.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/87357561165.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/fodolowezilukezox.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/gujuxiro.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb5cdbcf30---zugoxamuvovusila.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/bijaxokizumapokiwop.pdfIn PDF document text
    • https://flyags.com/editorResources/file///10345890014.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/madizu.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_off0000ac70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC70 10828 bytes
SHA-256: 0fcdbbdd737d9625920f0688d4f926669c240a5ae66de12f3ce10c8ab6361ccb
font_01_sfnt_off0000c57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 14592 bytes
SHA-256: 44cd0309ca498ce5d59bb5a6975912f550b74c03c978dbac5c6b1e8baa3fce86