Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf02686d72e5a71…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 14:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8dc03ebc096d591a202321a2cb24ca0f SHA-1: bde92cf3846c631858436a617371395d35d787ce SHA-256: acf02686d72e5a71297d68ea3be805aadb4eeacab56916057fcef08c9f01c9d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to potentially malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://cructi.ru/uplcv?utm_term=how+to+update+note+4 PDF link annotation
    • http://braghieriarchitettura.com/userfiles/files/lajimifodavi.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/zumafufegiliponopomezu.pdfIn PDF document text
    • http://yongqingtech.com/d/files/87755444316.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/96908932792.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/63248027349.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/42469323852.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/semitososovonar.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/77683782951.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/limunewos.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/82100380936.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/80042841161.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/93671721626.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/80254247902.pdfIn PDF document text
    • https://beautydent.hu/editor_up/tibigebozobev.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21893c085---degerutovose.pdfIn PDF document text
    • http://lejonhund.com/upload/48197439593.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210923124905.pdfIn PDF document text
    • https://kratky.eu/files/file/89130779739.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/vikusavaxedufutan.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/23591416496.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rf8eodnd4sinq44ac9s3r26h0c/riwulideraxixavo.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/91320896489.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/42409013188.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/90956436208.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/zuniluwuwudurelekodag.pdfIn PDF document text
    • https://actor-conseil.com/files/file/14478109385.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_off0000b252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA69 10232 bytes
SHA-256: b2b8e349aeecc41c62545cb24051d997d607dc98e4a510089c082755144e97e2
font_02_sfnt_off0000e188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 15676 bytes
SHA-256: 158137c525342ec01fe256911bcc8d20ee0c90a10d5d0bb222cac9f4125d7030

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