Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0b0eeb168da38e…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 15:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 783b8e48e674b5004e5de56bfb942325 SHA-1: 93b23a0507fc4b9243ee667ca5022264cd144e37 SHA-256: af0b0eeb168da38e300b8cff5f67753ee4eef90c6bf00696d1c1225fd95e063c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting and are likely used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nomylo.ru/uplcv?utm_term=today%27s+english+version+bible+pdf PDF link annotation
    • http://ldkxzzs.com/images/userfiles/file/55786956250.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/31800875299.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/dovedaduxaf.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/zonematibemekorakitukuv.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/28991199688.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c57dabbadd9d5d4ce67dc7e0e10fad74/zevukew.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23602934187.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/72641101801.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/simogopizirelajakizagowa.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/99997704626.pdfIn PDF document text
    • http://josquin-capella.de/download/20182696079.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/42839499312.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149550cae6c2---51463247203.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/22881758600.pdfIn PDF document text
    • http://synhbio.com/upload/files/reluzularutobisaxabidof.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-16/20210916082822595642.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/kasezegutovomaxijotul.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/jorul.pdfIn PDF document text
    • https://temahr.hr/files/15352961255.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/30860368168.pdfIn PDF document text
    • http://ustunongel.com/image/files/69070991915.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_off0000af37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF37 15004 bytes
SHA-256: 98f87493532114f37c36dbf30c3161ac68de2f29cd5550cb814872fe5b74a919
font_01_sfnt_off0000d53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53B 10996 bytes
SHA-256: c24b7b9119290d35c085b663813baff639d2443ad6c2a91c82c83fb73b262c14
font_02_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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