Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7068b4064cf0194…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 07:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ede93d1f0fd2d975663e4ca2c7c21b7 SHA-1: f8926059d5c96d77e62230bce938f42179458b76 SHA-256: a7068b4064cf019447cca569aca578ffef031e02951a07e697566e4e64982ec3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple engines, including ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are on disposable hosting, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the overall detection strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ktcz.eu/files/files/gukuvi.pdf In PDF document text
    • http://behtarinekhodetbash.com/files/files/kigujiwutagexesezevarodig.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210926112538_1007696673.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/12291291418.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/38586315686.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/velesititofolanebot.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/novewed.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318f47114f2---23261616762.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/61261462295.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/34886025780.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/koxafajituloweno.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/kelexak.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/73670069780.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/jinolosinefonul.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/pagadiputale.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/26428437040.pdfIn PDF document text
    • http://uchid.com/uploads/file/mudedoxaxexa.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/zojumijen.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/68733562667.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/susilivogetajizuxusezobe.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/lalexulited.pdfIn PDF document text
    • https://retta-bg.com/userfiles/jaxasisilu.pdfIn PDF document text
    • https://fultoys.com/userfiles/56698338132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=phone+sms+app+is+set+as+defaultPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/nanoxadogadurax.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_off0000b41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41B 16748 bytes
SHA-256: 064b7572b1286d2ab1be0d3d4342731c7d8a622ce672ea95007a3e087d5a7674
font_01_sfnt_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 10764 bytes
SHA-256: f03550baff0d46ae01ed04df4d06db5897d3173b49c400b0d42f5b1f3c87520d