Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e825bf004de7d2b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 14:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 28c6007427d0aec1b785a4da1ce38b92 SHA-1: b4dec5f6dff2cfa155578c49519a49daa9cb0a84 SHA-256: 0e825bf004de7d2bd27fa0cca60d71d4afee2c2c43c00b0bf96af38b7d26458d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs pointing to other PDF files hosted on various domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://101balkon.ru/upload/files/26666075125.pdf In PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/fuwum.pdfIn PDF document text
    • http://dfanchem.com/upload/files/65391403764.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210901054550.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/zaniz.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/fagobogavedemimafixeba.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/70868657567.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/21402402547.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109111743527278.pdfIn PDF document text
    • https://topupdana.com/contents/files/98208584672.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/41650230001.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/wopikamusafegafoloji.pdfIn PDF document text
    • https://purefeeling8.com/data/file/doxovekizuloxazaxade.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109040149427052.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/38652472631.pdfIn PDF document text
    • https://renetravel.ro/images/files/97279207147.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210910_8770BF1A6E7ACDC7.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/wetosamogiri.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/xilowob.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/jisir.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091003214797817.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/79565387858.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/54727980153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=all+call+recordingPDF 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_off0000d12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12C 18216 bytes
SHA-256: 938487c6c0cc1820e5c8180672fa1f698424c11ca265b2230799382919eeec12
font_01_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11846 10260 bytes
SHA-256: f48a0322b59da7384d9499054c931b1aa2653a768a92a0a44b2f773cdce71462

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