Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa7501a82a1fd57…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 02:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2b1137195a512680e0ba7c95ef0fb56c SHA-1: 9d7e16bb03245820adec393cb65c76021d923ecd SHA-256: 7fa7501a82a1fd573c3c50140c505753cc37a39451f006a89b829f8c43c1d869
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the PDF is designed to redirect users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://assytekservizi.com/userfiles/files/59805441066.pdf In PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/ratow.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/valatuwadoxapuzi.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/mojulowujoxuxufexotatev.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/45609138862.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/viweva.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210918122636.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/giwegikunisabikaga.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/96579780193.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/93252621675.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/93915239505.pdfIn PDF document text
    • http://chenruichem.com/upload/files/giwokifonewoxu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ncvi1in6h6f5lkhumbarghe7l1/81110956047.pdfIn PDF document text
    • http://ruihuitax.com/files/file/zovewewaveku.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/92651431875.pdfIn PDF document text
    • https://orrizon.ru/images/file/vejut.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/31871178038.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lkp4tu7ur1cjn3mvi9fg8nguc6/ziwokogebovin.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/lalesawunozadudufe.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/41035886014.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/ragudem.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021092607081340.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/41309570967.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/73956173109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=metal+slug+2+mod+apkPDF 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_off0000adb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB9 10744 bytes
SHA-256: be95f3e4bf7d241b4dc3fdaebddfd542a30dcebb900336f7c1c34807240ac891
font_01_sfnt_off0000c668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 14780 bytes
SHA-256: 011402aaa8385d09f3e082f64ba3653330cc0f46decbd16b541fe9e096f3174b