Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed661e9cd055ae0…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 20:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6be8f9c97a485824126dd6d801678f66 SHA-1: a45deb5d6e33ba0283f0b6624d6c1132fd00c3f8 SHA-256: aed661e9cd055ae0c202480e160df23e5834b2a2d995abad9cae01fd567347c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://allytemp.ru/uplcv?utm_term=spider+man+far+from+home+free+full+movie+online PDF link annotation
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137898ebb17e---54832207955.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/97491388692.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210904_171751.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/tegugekuroju.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090718595273499.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/jovatuxoxisaxuzusev.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/65883523450.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210903143514.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/xududusitafonatovixat.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/wobopadelovomapeda.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/39830664104.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/sesimosomenifop.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/95675497878.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/popijekukeguvirumifake.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/47204451219.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/78538807949.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905022558.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/muniwanevimi.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/joletijeg.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/58072644629.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/dolevekexilekowegamaxa.pdfIn PDF document text
    • https://angkagenap.com/contents/files/83352853356.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/21135074466135e8f742d98.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109020347321718.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_off0000de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 10736 bytes
SHA-256: 05ee3e55806fdc8a952975f63dfdfb150b11535138c71843598d05e6694a0246
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 19228 bytes
SHA-256: ffb8cf16b96f17af1df34c011001e21f07750c4ae163af719d38a5f48f626c90

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